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台灣交通號誌、基礎設施與管理伺服器，是否面臨被駭威脅？
從安全五層次，檢視交通號誌、交控基礎設施與管理伺服器的風險與防線
每天上下班經過路口，我們幾乎不會思考一件事：眼前的紅綠燈，究竟是誰在控制？
傳統交通號誌可以是一套相對單純的機電設備，但智慧交通發展到今天，路口號誌、號誌控制器、車流偵測器、影像設備、路側設備、通訊網路、交通控制中心、資料庫、管理平台，甚至雲端服務，已逐漸形成一張彼此連結的交通神經網路。
這張網路讓城市交通變得更即時、更有效率，卻也產生一個以前不太需要面對的問題：
如果有人不是站在路口破壞號誌，而是從網路另外一端進來呢？
這不是要製造「台灣號誌已經被駭」的恐慌。截至目前可以查到的公開資訊，仍不足以證明台灣曾發生駭客成功大規模接管交通號誌、任意變更燈號的公開確認案例。但另一方面，也不能因此得到「台灣交通系統沒有被駭風險」的結論。
真正值得討論的，是交通系統已經從交通工程問題，進一步成為資通安全、城市韌性，甚至國家安全問題。
先用安全五層次探討這個議題
如果只把交通資安理解成「號誌控制器有沒有防火牆」，其實把問題看得太小。
交通號誌與交通控制系統的資安，可以用「安全五層次」重新拆解。
安全層次 | 交通資安真正要處理的問題 |
基礎安全 | 設備盤點、密碼、韌體更新、通訊加密、網路隔離、弱點修補 |
程序安全 | 誰能登入？誰能修改時制？誰能遠端維護？變更是否經過審批與留下紀錄？ |
風險管理 | 能不能發現異常登入、異常流量、設備離線、設定被改動，以及供應鏈風險？ |
韌性安全 | 系統被攻擊或中斷後，能否分區隔離、切換備援、人工接管並維持交通運作？ |
永續安全 | 設備生命週期、定期稽核、攻防演練、供應鏈治理與持續改善是否制度化？ |
因此，真正的交通資安不是「保護一支號誌燈」。
而是要保護整個路口設備—通訊網路—管理平台—維運人員—供應鏈所構成的系統。
風險不只在號誌燈本身
智慧交通越發展，可能的攻擊面其實越多。
第一層是最靠近道路的號誌控制器、路側控制箱、車流偵測器、影像設備與其他 IoT 設備。這些設備通常使用年限長，而且分布廣泛，有些可能位於無人看守的戶外環境。
第二層是通訊。現在交通設備可能透過光纖、專網、VPN、4G/5G或其他網路傳回控制中心。如果網路架構、加密與存取控制不足，就可能出現新的攻擊入口。
第三層則是交通控制中心與管理伺服器。這裡管理的不只是紅綠燈，還可能包含路況資料、交通資訊發布、影像、設備狀態與各種智慧交通應用。
最後還有一個經常被忽略的入口：遠端維運。
設備供應商、系統整合商、維護工程師如何登入？帳號多久換一次？離職人員帳號有沒有取消？維護筆電是否安全？遠端連線是否需要多因子驗證？
很多重大資安事件未必來自電影裡那種「天才駭客破解中央電腦」，反而可能從一組沒有更改的預設密碼開始。
國家資安研究院 2026 年的實兵演練，就曾發現部分 IoT 設備管理介面直接暴露於外部網路，而且存在預設帳號或弱密碼問題；其他演練也發現遠端桌面服務暴露、驗證機制失效，以及軟體供應鏈弱點等情況。這些結果不是在證明某一套路口號誌已遭入侵，而是在提醒：同樣的技術弱點，只要存在於交通設備與管理平台，就可能成為入口。
台灣曾有哪些疑慮與警訊？
2026 年 4 月，中國高德地圖在台灣部分地區顯示紅綠燈倒數秒數，引起外界對交通號誌資料是否被取得的疑慮。
交通部隨即澄清，交通部運輸資料流通服務平臺 TDX 並未提供紅綠燈即時秒數，也沒有提供相關 API；交通部並表示，我國號誌控制相關資料透過政府專用網路傳輸，受到防火牆等措施保護，而高德所呈現的秒數，研判是利用使用者 GPS、車速及停等資料，進行大數據推估所得。新北市交通局也另外表示，其交控號誌系統採封閉式環境，與外部公開網路分開。
所以這一事件不能寫成「高德取得台灣號誌系統資料」，更不能直接說成「交通號誌被駭」。
但它仍然是一個很好的警訊。
因為它讓社會第一次很具體地問了一個問題：
我們的號誌時制、交控資訊與交通管理系統，到底哪些資料可以被外部取得？哪些屬於敏感資訊？哪些系統與公開網路隔離？
更重要的警訊則來自國安單位。
國安局在「2024 年中共網駭手法分析」中直接指出，中共網軍透過進階持續性滲透、釣魚郵件、零時差漏洞、木馬及後門程式等方式，企圖對我國公路、港務等關鍵基礎設施駭攻設伏，以影響交通運輸秩序；報告也提到，相關網攻可能與對台軍演結合，對交通、金融等基礎設施發動網路襲擾。
這已經使問題從「會不會有人惡作劇改紅綠燈」，提升到另一個層次：
交通基礎設施是不是可能成為地緣政治衝突的一部分？
政府做過什麼演習與演練？
台灣並不是完全沒有注意到這個問題。
交通部近年持續辦理「關鍵基礎設施資安攻防演練」。2024 年 10 月舉辦 113 年度演練經驗分享會，2025 年又辦理 114 年度相關活動，其議程已直接包含「紅隊演練結果」以及「藍隊經驗分享」；到 2026 年 9 月 2 日，交通部仍持續舉行 115 年關鍵基礎設施資安攻防演練經驗分享會。
這代表政府的思維已逐漸從傳統的「做資安檢查」，轉向模擬真正攻擊者如何進入系統。
這是很重要的轉變。
因為資安演練真正要驗證的，不只是「能不能擋住」。
還包括：
攻擊發生多久能發現？誰負責通報？哪些設備必須立刻隔離？中央管理平台停止服務後，路口還能不能獨立運作？號誌可不可以切回既定時制？必要時能不能人工接管？交通警察多久可以介入？備援中心多久可以接手？
這些其實已經進入安全五層次中的第四層 —— 韌性安全。
國外警訊：2024列支敦斯登 Gnalp–Steg 隧道
2024 年 2 月 3 日，列支敦斯登 Gnalp–Steg 隧道的交通號誌系統發生全面故障。
列支敦斯登政府公布的資訊指出，設備製造商初步判斷，事故可能由惡意軟體所造成，而惡意軟體如何進入號誌系統伺服器，當時仍在調查。事件發生後，主管機關先派員人工進行交通管制，之後再設置臨時施工號誌維持隧道交通。
這個案例特別值得台灣注意。
因為它不是大型國家資料中心，也不是金融銀行，而是隧道交通號誌伺服器。
更值得注意的是事故後的處置：系統失效後還有人工控制，人工控制之後還有臨時號誌。
這正好說明一件事：
最好的資安不只是永遠不被攻破，而是即使數位系統失效，交通仍然能安全運作。
這就是韌性。
國外警訊：2024 美國 Kansas City KC Scout
另一個更具代表性的案例，是美國堪薩斯城的 KC Scout。
KC Scout 是由 Missouri 與 Kansas 兩州交通部門共同運作的都會區智慧交通管理系統。2024 年 4 月 25 日遭遇網路攻擊後，營運單位主動關閉相關系統，包括 KC Scout 網站、交通攝影機與高速公路資訊看板。
這次事件並不是「駭客把整座城市紅綠燈變成綠燈」。
但是它反而揭露一個更符合現代智慧交通的問題：
攻擊交通資訊平台，同樣可以影響交通系統運作。
KC Scout 的即時資訊看板，直到當年 6 月 20 日才逐步恢復，網站及即時攝影機畫面則到 7 月 9 日才恢復，前後影響長達數週。
所以智慧交通的資安，不應只盯著號誌控制器。
資訊發布平台、交通攝影機、管理伺服器、資料庫、網路設備與維運系統，全部都是交通運作的一部分。
台灣位在地緣政治前線，交通資安不能只是一般 IT 問題
台灣與許多國家最大的不同，是所處的地緣政治環境。
交通系統平時負責的是人流、物流與城市運作；但在天然災害、重大事故甚至非常時期，它同時承擔救援、疏散、醫療、物資與國家持續運作的重要功能。
因此，交通號誌、交通控制中心、高速公路、鐵路、港口及相關通訊與資訊平台，不能只用「系統不能當機」的 IT 思維來規劃。
而應該進一步問：
- 如果發生協同式網路攻擊，哪些交通服務必須優先維持？
- 中央平台停止後，地方設備能不能獨立？
- 某一個城市交控中心失效後，是否有替代管理能力？
- 通訊中斷後是否可以離線運作？
這就是從「Cybersecurity」走向「Cyber Resilience」。
資安署 2026 年修訂《關鍵資訊基礎設施資安防護建議》，也特別納入設備控制系統防護、老舊設備補償控制，以及設施擁有者、系統包商與零件供應商之間的責任分工。
市場傳聞：台灣交通與公共監控設備，紅色供應鏈占比很高？
這也是這篇探討不能迴避、卻最需要謹慎處理的一題。
市場長期存在一種說法：台灣公共建設及影像監控設備，有相當比例來自中國供應鏈。
問題是 —— 到底是多少？
如果沒有完整盤點，就不應該把「很多」、「大多數」甚至某個百分比直接寫成事實。但是這不代表問題不存在。更重要是不必讓我們的交通安全處在市場口耳相傳，但是卻不是經過證實的傳聞。
2022 年，新竹工業區也曾因採購疑似中國製貼牌監視系統，引發監察委員調查。所以問題已經不能只停留在「品牌是哪一國」。
真正要查的是：
設備是誰設計的？主要晶片與模組來自哪裡？韌體由誰維護？資料會連到哪一個伺服器？有沒有境外雲端？遠端維護權限掌握在誰手中？產品有沒有 SBOM？漏洞出現後誰負責修補？
目前政府已規定，公務機關原則禁止使用大陸廠牌資通訊產品；新版「危害國家資通安全產品審查辦法」也要求透過產品、物料清單或軟體物料清單進行審查與情資分享。
但如果市場仍長期存在「政府公共監控到底用了多少紅色供應鏈設備」的傳聞，主管機關更好的處理方式，不只是一次次說「依法不得使用」。
而是主動盤點、分類說明、定期稽核並公布可以公開的統計結果。
例如多少設備已完成來源查核、多少正在汰換、多少存在特殊原因暫時使用、多少完成韌體及境外連線檢測。
數字公開，傳聞自然會逐漸消失。
交通資安防線：風險點 × 五層次應對
如果把整篇討論重新收斂，可以得到下面這個矩陣。
風險位置 | 基礎安全 | 程序安全 | 風險管理 | 韌性安全 | 永續安全 |
現場設備 | 密碼、韌體、設備盤點 | 設定修改審批 | 異常設定偵測 | 獨立／人工控制 | 生命週期與定期稽核 |
通訊網路 | 加密、分區、VPN | 連線權限管理 | 異常流量監測 | 備援線路 | 定期弱點檢測 |
管理平台 | 修補、MFA、帳號安全 | 最小權限、操作紀錄 | SIEM／告警／追蹤 | 備援中心與資料備份 | 持續資安稽核 |
維運人員 | 強身分驗證 | 申請、審批、離職停權 | 異常登入分析 | 緊急帳號管理 | 定期社交工程與攻防演練 |
供應鏈 | 設備來源盤點 | 採購安全規範 | SBOM、漏洞與境外連線監測 | 替代供應商 | 定期供應鏈安全評鑑 |
真正需要避免的，是把所有力氣都花在第一欄。
因為買了防火牆、換了密碼、禁止中國品牌，仍然只是基礎安全。
能不能管理變更、發現異常、立即隔離、人工接管、恢復營運，再透過下一次採購與演練把問題消除，才構成完整安全能力。
結語：不要等事故發生，才開始補安全
台灣現在真正值得問的，不是：
「到底有沒有哪一個紅綠燈已經被駭？」
而是：
「如果明天有人開始攻擊，我們多久會知道？」
更進一步是：
「即使他真的進來了，我們能不能讓交通繼續安全運作？」
Gnalp–Steg 隧道告訴我們，交通號誌伺服器確實可能受到惡意軟體影響；KC Scout 告訴我們，智慧交通資訊平台遭受網攻，就足以讓重要交通服務中斷數週。
台灣的國安情勢，又讓這個問題多了一層不能忽略的背景。
因此，交通號誌、路側設備、交通控制中心、管理伺服器、通訊網路、影像設備、遠端維運及供應鏈，最好不要再各自被視為孤立的設備。
它們其實共同構成一套城市運作系統。
基礎安全，讓它不容易被攻進來；程序安全，避免錯誤與權限失控；風險管理，讓攻擊能被發現；韌性安全，確保遭受攻擊仍能運作；永續安全，則讓每一次事故、演練與採購，都成為下一次安全能力提升的起點。
交通號誌看似只是路口的一盞紅燈、一盞綠燈。
但在智慧城市與地緣政治交錯的今天，它背後連接的，已經是整座城市的數位神經。
守住每一個路口，不只是守住交通秩序，也是在守住城市與國家的韌性。
English version
Are Taiwan’s Traffic Signals, Infrastructure, and Management Servers Facing Cyberattack Threats?
Examining the Risks and Defenses of Traffic Signals, Traffic Control Infrastructure, and Management Servers Through the Five Levels of Security
Every day, people drive through intersections without giving much thought to one simple question:
Who is actually controlling the traffic lights in front of us?
Traditional traffic signals could once be treated as relatively standalone electromechanical systems. Today, however, smart transportation has connected traffic lights, signal controllers, vehicle detectors, video surveillance devices, roadside equipment, communication networks, traffic control centers, databases, management platforms, and even cloud services into an increasingly integrated digital transportation network.
This network makes urban traffic more responsive and efficient. At the same time, it creates a question that cities rarely had to consider in the past:
What happens if an attacker does not physically tamper with a traffic light, but instead enters the system from somewhere across the network?
The purpose of this discussion is not to create panic by claiming that Taiwan’s traffic signals have already been hacked. Based on currently available public information, there is still insufficient evidence to conclude that hackers have successfully taken large-scale control of Taiwan’s traffic signal systems or arbitrarily changed signal phases.
But the absence of such a publicly confirmed case does not mean that the threat does not exist.
The real issue is that transportation systems have evolved beyond the boundaries of traffic engineering. They are now also cybersecurity, urban resilience, and even national security issues.
Understanding the Issue Through the Five Levels of Security
If transportation cybersecurity is reduced to a simple question such as whether a signal controller has a firewall, then the problem has already been framed too narrowly.
Cybersecurity for traffic signals and traffic control systems can be examined through the Five Levels of Security.
Security Level | What Transportation Cybersecurity Must Actually Address |
Basic Security | Asset inventory, passwords, firmware updates, encrypted communications, network segmentation, vulnerability patching |
Procedural Security | Who may log in? Who may modify signal timing? Who may perform remote maintenance? Are changes approved and logged? |
Risk Management | Can the system detect abnormal logins, unusual network traffic, device outages, configuration changes, and supply-chain risks? |
Resilience Security | If systems are attacked or disrupted, can affected zones be isolated, backups activated, and manual control maintained? |
Sustainable Security | Are lifecycle management, regular audits, cyber exercises, supply-chain governance, and continuous improvement institutionalized? |
Transportation cybersecurity is therefore not simply about protecting a traffic light.
It is about securing the entire chain of roadside equipment, communication networks, management platforms, maintenance personnel, and suppliers.
The Risk Is Not Limited to the Traffic Light Itself
As smart transportation systems become more advanced, the potential attack surface also becomes larger.
The first layer includes roadside signal controllers, cabinets, traffic detectors, surveillance devices, and other IoT equipment. These devices often have long service lives, are widely distributed, and may be installed in outdoor environments with little or no physical supervision.
The second layer is communications. Modern transportation equipment may transmit data through fiber networks, private networks, VPNs, 4G, 5G, or other communication infrastructure. If network architecture, encryption, or access control is weak, these connections may become additional points of entry.
The third layer consists of traffic control centers and management servers. These systems may manage far more than traffic lights. They can also handle traffic data, traveler information, video feeds, device status, and various smart transportation applications.
There is also another entry point that is often overlooked:remote maintenance.
How do equipment vendors, systems integrators, and maintenance engineers log in? How often are passwords changed? Are former employees’ accounts disabled? Are maintenance laptops secure? Does remote access require multi-factor authentication?
Many major cyber incidents do not begin with a cinematic hacker breaking into a central computer.
They may begin with something as simple as a default password that was never changed.
Taiwan’s National Institute of Cyber Security reported in 2026 that red-team exercises had identified IoT management interfaces directly exposed to external networks, default credentials, weak passwords, exposed remote desktop services, authentication failures, and software supply-chain vulnerabilities.
These findings do not prove that a particular traffic signal system has been compromised.
They do, however, illustrate a broader point:
If similar weaknesses exist in transportation equipment or management platforms, they can become attack vectors.
What Concerns and Warning Signs Have Appeared in Taiwan?
In April 2026, China’s Amap service displayed countdown timing information for traffic signals in parts of Taiwan, raising public concern over whether traffic signal data had somehow been obtained from Taiwan’s transportation systems.
Taiwan’s Ministry of Transportation and Communications clarified that the Transportation Data eXchange, or TDX, does not provide real-time traffic-signal countdown data or related APIs. The ministry also stated that signal-control data are transmitted through government-only networks protected by firewalls and other measures.
The ministry assessed that Amap’s displayed countdown information was more likely generated through big-data estimation based on users’ GPS signals, vehicle speed, and waiting times. New Taipei City’s transportation authorities also stated that their traffic signal control systems operate in a closed environment separated from the public Internet.
This incident therefore should not be described as evidence that Amap obtained access to Taiwan’s traffic signal systems.
Nor should it be described as a confirmed cyber intrusion.
However, it still served as an important warning.
It forced the public to ask some very practical questions:
Which traffic-signal data can be inferred or obtained externally? Which information should be considered sensitive? Which systems are genuinely isolated from public networks?
A more serious warning has come from Taiwan’s national security authorities.
In its analysis of Chinese cyberattack activity in 2024, Taiwan’s National Security Bureau stated that Chinese cyber forces attempted to establish footholds within critical infrastructure sectors, including highways and port operations, using advanced persistent threats, phishing, zero-day vulnerabilities, malware, and backdoors.
The bureau further warned that cyber operations could potentially be coordinated with military exercises or other forms of pressure, targeting transportation, finance, and other critical infrastructure.
This moves the discussion far beyond the question of whether someone might maliciously change a traffic light.
The larger question becomes:
Could transportation infrastructure itself become part of a geopolitical confrontation?
What Cyber Exercises and Drills Has the Government Conducted?
Taiwan has not ignored this issue.
In recent years, the Ministry of Transportation and Communications has continued to conduct cybersecurity attack-and-defense exercises for critical infrastructure.
In October 2024, the ministry held a session sharing lessons from that year’s exercises. Similar activities continued in 2025, including presentations on red-team findings and blue-team defensive experience. By September 2, 2026, the ministry was still conducting annual critical infrastructure cybersecurity exercise review and experience-sharing activities.
This indicates an important shift in government thinking.
The approach is moving away from simply conducting routine cybersecurity inspections and toward simulating how a real attacker might actually enter a system.
That shift matters.
Because the real purpose of an exercise is not only to ask whether an attack can be blocked.
It should also ask:
- How quickly can the intrusion be detected?
- Who is responsible for reporting it?
- Which devices should be isolated immediately?
- If a central management platform becomes unavailable, can roadside signals continue to operate autonomously?
- Can signal controllers fall back to predefined timing plans?
- Can operators switch to manual control?
- How quickly can traffic police intervene?
- How long would it take for a backup control center to assume operations?
These questions are already part of the fourth level of the Five Levels of Security:
Resilience Security.
International Warning: The 2024 Gnalp–Steg Tunnel Incident in Liechtenstein
On February 3, 2024, the traffic signal system at the Gnalp–Steg Tunnel in Liechtenstein suffered a complete failure.
According to information released by the Liechtenstein government, the equipment manufacturer initially assessed that malicious software may have caused the disruption. How the malware entered the traffic signal server was still under investigation at the time.
After the incident, authorities first deployed personnel to manually manage traffic and later installed temporary construction traffic lights to maintain tunnel operations.
This case is particularly relevant to Taiwan.
It did not involve a massive national data center or a major financial institution.
It involved a traffic signal server used for tunnel operations.
The response is just as important as the incident itself.
When the system failed, manual traffic control was available.
When manual control proved insufficient as a long-term solution, temporary signal systems were deployed.
This demonstrates a fundamental principle:
The best cybersecurity strategy is not merely to assume that systems will never be breached. It is to ensure that transportation can still operate safely even when digital systems fail.
That is resilience.
International Warning: The 2024 Kansas City KC Scout Cyberattack
Another important case occurred in the United States with the Kansas City KC Scout system.
KC Scout is a metropolitan intelligent transportation management system jointly operated by the Missouri and Kansas Departments of Transportation.
On April 25, 2024, the system suffered a cyberattack. Authorities subsequently shut down portions of the system, including the KC Scout website, traffic cameras, and highway message boards.
This was not a case in which hackers turned all traffic lights green.
In fact, the incident highlights a more realistic vulnerability in modern smart transportation:
Attacking the information platform can itself disrupt transportation operations.
KC Scout’s dynamic message signs did not begin returning to service until June 20. Its website and live traffic camera feeds were not restored until July 9.
The disruption therefore lasted for weeks.
This is why transportation cybersecurity should not focus exclusively on traffic signal controllers.
Traveler information systems, traffic cameras, management servers, databases, network infrastructure, and maintenance platforms can all be part of the transportation attack surface.
Taiwan Is on the Geopolitical Front Line — Transportation Cybersecurity Cannot Be Treated as a Routine IT Problem
Taiwan differs from many countries because of its geopolitical environment.
Under normal conditions, transportation systems manage the movement of people, goods, and urban activity.
During natural disasters, major accidents, or national emergencies, however, the same systems become critical to evacuation, rescue operations, medical transportation, logistics, emergency response, and continuity of government and economic activity.
For that reason, traffic signals, traffic control centers, expressways, railways, ports, and the communication and information platforms supporting them should not be managed solely under the traditional IT assumption that “the system must not go down.”
A more demanding set of questions is required:
If a coordinated cyberattack occurs, which transportation functions must remain operational first?
If the central management platform fails, can local equipment continue operating independently?
If a city traffic control center goes offline, is there an alternative command capability?
If communications are disrupted, can the system continue operating offline?
This is the shift from cybersecurity to cyber resilience.
In 2026, Taiwan’s Administration for Cyber Security revised its guidance for critical information infrastructure protection, placing greater emphasis on industrial control protection, compensating controls for legacy systems, and clearer responsibilities among infrastructure owners, systems contractors, and component suppliers.
Market Rumors: Is Taiwan’s Transportation and Public Surveillance Equipment Highly Dependent on Chinese Supply Chains?
This is one of the most sensitive issues in this discussion, and also one that must be handled carefully.
For years, the market has circulated claims that a significant proportion of surveillance and public infrastructure equipment used in Taiwan comes from Chinese supply chains.
The problem is simple:
How much is “a significant proportion”?
Without a complete and transparent inventory, terms such as “many,” “most,” or any specific percentage should not be presented as established fact.
That does not mean the underlying concern is imaginary.
In March 2025, Taiwan’s Investigation Bureau announced a case involving China-made surveillance equipment that had allegedly been relabeled as Taiwan-made products.
According to the bureau, the company involved had long imported surveillance recorder components from China, performed relatively simple assembly in Taiwan, and then labeled the products as made in Taiwan. Some of the products had entered government procurement channels.
Investigators also found that certain surveillance recorders had connections to cloud servers located in China.
Earlier, in 2022, Taiwan’s Control Yuan also investigated concerns over allegedly China-made surveillance systems that may have been relabeled and installed in the Hsinchu Industrial Park.
The real issue can therefore no longer be reduced to a question of brand nationality.
The more meaningful questions are:
- Who designed the equipment?
- Where do the key chips and modules come from?
- Who maintains the firmware?
- Where does the data connect?
- Does the system communicate with overseas cloud services?
- Who controls remote maintenance privileges?
- Does the product provide a Software Bill of Materials, or SBOM?
Who is responsible for patching vulnerabilities after deployment?
Taiwan’s government has already established rules that, in principle, prohibit government agencies from using Chinese-branded information and communications technology products.
Updated regulations governing products that may endanger national cybersecurity also require reviews based on product inventories, Bills of Materials, or Software Bills of Materials, together with cybersecurity intelligence sharing.
But if the market continues to debate whether public surveillance infrastructure still contains significant portions of Chinese-origin supply-chain equipment, the best response from competent authorities should not simply be to repeat that such products are prohibited by policy.
A stronger response would be to actively inventory, classify, verify, and disclose appropriate statistics.
For example:
- How many devices have completed supply-source verification?
- How many are being phased out?
- How many remain in operation due to special circumstances?
- How many have been inspected for firmware risks or unauthorized overseas connections?
Transparency is often the fastest way to reduce speculation.
Transportation Cybersecurity Defense: Risk Points × Five Levels of Security
The entire discussion can be condensed into the following matrix.
Risk Area | Basic Security | Procedural Security | Risk Management | Resilience Security | Sustainable Security |
Field Equipment | Passwords, firmware, asset inventory | Approval for configuration changes | Detection of abnormal settings | Standalone/manual control | Lifecycle management and periodic audits |
Communication Networks | Encryption, segmentation, VPN | Connection access control | Abnormal traffic monitoring | Backup communications | Periodic vulnerability assessments |
Management Platforms | Patching, MFA, account security | Least privilege, audit logs | SIEM, alerts, traceability | Backup control centers and data recovery | Continuous security auditing |
Maintenance Personnel | Strong authentication | Request, approval, offboarding | Abnormal login analysis | Emergency account controls | Social engineering and red-team exercises |
Supply Chain | Supplier and device-source inventory | Cybersecurity requirements in procurement | SBOM, vulnerability and overseas-connection monitoring | Alternative suppliers | Periodic supply-chain security reviews |
The key mistake to avoid is putting all resources into the first column.
A firewall, a password change, or a ban on particular brands may strengthen Basic Security.
But complete security requires much more.
- Can changes be governed?
- Can abnormal behavior be detected?
- Can affected systems be isolated?
- Can operations switch to manual control?
- Can services recover?
- Can the lessons from an incident or exercise be carried into the next procurement cycle?
Only when all of these are addressed does an organization begin to build a complete security capability.
Conclusion: Do Not Wait for an Incident Before Building Security
The most useful question for Taiwan today is not:
“Has a traffic light already been hacked?”
The more important question is:
“If someone starts attacking tomorrow, how long will it take us to know?”
And beyond that:
“Even if an attacker gets in, can we keep the transportation system operating safely?”
The Gnalp–Steg Tunnel incident demonstrated that malicious software can affect a traffic signal server.
The KC Scout attack demonstrated that compromising an intelligent transportation information platform can disrupt critical transportation services for weeks.
Taiwan’s geopolitical environment adds another layer of urgency.
Traffic signals, roadside equipment, traffic control centers, management servers, communication networks, video surveillance systems, remote maintenance channels, and supply chains should no longer be regarded as separate, isolated assets.
Together, they form part of the digital nervous system of a city.
- Basic Security makes systems harder to penetrate.
- Procedural Security prevents uncontrolled access and operational mistakes.
- Risk Management makes attacks visible.
- Resilience Security keeps transportation functioning during disruption.
- Sustainable Security turns every incident, exercise, audit, and procurement decision into an opportunity to strengthen future security.
A traffic signal may appear to be nothing more than a red light and a green light at an intersection.
But in the era of smart cities and geopolitical confrontation, the network behind that signal is increasingly connected to the operation of the entire city.
Protecting every intersection is no longer only about maintaining traffic order. It is also about protecting the resilience of the city — and, ultimately, the resilience of the nation.
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