--- title: "What will warn you of congestion or incidents… | Theory Test" description: "What will warn you of congestion or incidents when travelling through a long tunnel? The correct answer is “Variable message signs”. Read the instructor's exp" lang: en json-ld: | [ { "@context": "https://schema.org", "@graph": [ { "@type": "Organization", "@id": "https://fasttrackdrivinglessons.co.uk/#organization", "name": "Fast Track Driving Lessons", "url": "https://fasttrackdrivinglessons.co.uk/", "email": "info@fasttrackdrivinglessons.co.uk", "areaServed": "GB", "description": "Intensive driving courses and driving lessons across the UK with DVSA-approved instructors." }, { "@type": "WebSite", "@id": "https://fasttrackdrivinglessons.co.uk/#website", "url": "https://fasttrackdrivinglessons.co.uk/", "name": "Fast Track Driving Lessons", "publisher": { "@id": "https://fasttrackdrivinglessons.co.uk/#organization" }, "potentialAction": { "@type": "SearchAction", "target": { "@type": "EntryPoint", "urlTemplate": "https://fasttrackdrivinglessons.co.uk/search?q={search_term_string}" }, "query-input": "required name=search_term_string" } } ] }, { "@context": "https://schema.org", "@type": "QAPage", "mainEntity": { "@type": "Question", "name": "What will warn you of congestion or incidents when travelling through a long tunnel?", "text": "What will warn you of congestion or incidents when travelling through a long tunnel?", "answerCount": 1, "acceptedAnswer": { "@type": "Answer", "text": "Variable message signs. Variable message signs provide real-time information about changing traffic conditions, such as incidents, lane closures, or congestion ahead in a tunnel. These electronic signs allow control centres to warn drivers immediately so they can reduce speed and take extra care. Static road markings cannot give live updates about dynamic events, and relying on other drivers flashing their headlights is unreliable, unsafe, and open to misinterpretation." }, "suggestedAnswer": [ { "@type": "Answer", "text": "Hazard warning lines" }, { "@type": "Answer", "text": "Other drivers flashing their lights" }, { "@type": "Answer", "text": "Hatch marked areas" } ] } } ] --- Get an exclusive 15% off - Offer ends next week! [![Fast Track Driving Lessons](/__l5e/assets-v1/7414b5e8-6448-43a5-87bf-63be1eb22dca/fasttrack-logo.png)](/) [Log in](/theory/account)[Get me driving](/course-recommender)Menu [Our Courses & Prices](/courses) [Driving Lessons](/driving-lessons) [Areas We Cover](/driving-lessons-in) [Learner Hub](/learn) [Theory Test](/theory) - [Theory hub](/theory) - [Book your test](/theory/book-theory-test) - [Cancellations](/theory/theory-test-cancellations) - [Free practice](/theory/practice) - [Mock tests](/theory/mock-test) - [Hazard perception](/theory/hazard-perception) - [Road signs](/theory/road-signs) - [Highway Code](/theory/highway-code) - [Motorcycle](/theory/motorcycle) - [Pricing](/theory/pricing) [Theory test](/theory)/ [Question bank](/theory/questions)/ Incidents, accidents and emergencies # What will warn you of congestion or incidents when travelling through a long tunnel? DVSA-style practice question · Incidents, accidents and emergencies ## The answer options - Hazard warning lines - Other drivers flashing their lights - Hatch marked areas - Variable message signs**Correct** ## Why that is the answer Variable message signs provide real-time information about changing traffic conditions, such as incidents, lane closures, or congestion ahead in a tunnel. These electronic signs allow control centres to warn drivers immediately so they can reduce speed and take extra care. Static road markings cannot give live updates about dynamic events, and relying on other drivers flashing their headlights is unreliable, unsafe, and open to misinterpretation. ## How this comes up in the real test Questions from incidents, accidents and emergencies appear throughout the 50-question multiple-choice section, and the wording changes between versions. Learn the rule rather than the sentence: the DVSA can ask the same point from the opposite direction, and a memorised answer falls over the moment the phrasing moves. The pass mark is 43 out of 50, so seven wrong answers is your entire margin. If a whole category is shaky, run the topic practice below until you are getting every question right for the right reason, then go back to full mocks under the clock. [Practise Incidents, accidents and emergencies](/theory/quiz/incidents-emergencies)[Sit a full mock test](/theory/mock-test) ## More incidents, accidents and emergencies questions - [After a collision, someone is unconscious in their vehicle. When should you call the emergency services?](/theory/questions/after-a-collision-someone-is-unconscious-in-their-vehicle-when-should-you-call-the-emergen) - [An adult casualty isn’t breathing. CPR should be administered to keep the blood flowing. How hard should you press against their chest?](/theory/questions/an-adult-casualty-isn-t-breathing-cpr-should-be-administered-to-keep-the-blood-flowing-how) - [An injured motorcyclist is lying unconscious in the road. The traffic has stopped and there’s no further danger. What could you do to help?](/theory/questions/an-injured-motorcyclist-is-lying-unconscious-in-the-road-the-traffic-has-stopped-and-there) - [An injured person has been placed in the recovery position. They’re unconscious but breathing normally. What else should be done?](/theory/questions/an-injured-person-has-been-placed-in-the-recovery-position-they-re-unconscious-but-breathi) - [At an incident, a casualty is unconscious but breathing. When should you move them?](/theory/questions/at-an-incident-a-casualty-is-unconscious-but-breathing-when-should-you-move-them) - [At an incident, a casualty isn’t breathing. What should you do while helping them to start breathing again?](/theory/questions/at-an-incident-a-casualty-isn-t-breathing-what-should-you-do-while-helping-them-to-start-b) ## Ready to book the real thing? Full Membership is £49 and covers your DVSA booking, one resit with no minimum mark, cancellation checking on theory and practical tests, and the Learning Hub. [Book my theory test](/theory/signup) ## Passed your theory? Get the practical booked Your theory certificate lasts two years. Most learners who use it quickly do it with an intensive course — a block of hours with a DVSA approved instructor and a practical test at the end, instead of one lesson a week for months. [Intensive course prices](/pricing)[All courses](/courses)[Crash courses](/crash-courses)[Automatic lessons](/driving-lessons/automatic)[Areas we cover](/driving-lessons-in)[Driving test centres](/driving-test-centres)[How it works](/how-it-works)[Test pass guarantee](/test-pass-guarantee) ### Book and manage - [Book your theory test](/theory/book-theory-test) - [Theory test cancellations](/theory/theory-test-cancellations) - [Theory test books](/theory/theory-test-books) - [Free resits](/theory/free-resits) - [Change your theory test](/theory/change-theory-test) - [Cancel your theory test](/theory/cancel-theory-test) - [Pricing](/theory/pricing) ### Free revision - [Practice by topic](/theory/practice) - [Mock theory test](/theory/mock-test) - [Question bank](/theory/questions) - [Road signs A–Z](/theory/road-signs) - [Hazard perception](/theory/hazard-perception) - [Highway Code hub](/theory/highway-code) - [Revision plan](/theory/theory-test-revision-plan) - [Your progress](/theory/account) ### Common questions - [Theory test pass mark](/theory/theory-test-pass-mark) - [How much is a theory test?](/theory/how-much-is-a-theory-test) - [When can I take it?](/theory/when-can-you-take-your-theory-test) - [How long is it valid?](/theory/how-long-is-a-theory-test-valid) - [What to take with you](/theory/what-to-take-to-your-theory-test) - [Waiting times](/theory/theory-test-waiting-times) ### Motorcycle and more - [Motorcycle theory test](/theory/motorcycle) - [CBT explained](/theory/motorcycle/cbt-explained) - [Module 1 and 2](/theory/motorcycle/module-1-and-module-2) - [Driving lessons](/driving-lessons) - [Intensive courses](/courses) - [Crash courses](/crash-courses) - [Learner Hub](/learn) © 2026 Fast Track Driving Lessons. Theory tests are set and marked by the DVSA; we handle booking, cancellation checking and revision. [Edit with ](https://lovable.dev/projects/lovp_0c9k10m8tb8fqrn77d2jpgxg8j?utm_source=lovable-badge) ## Cookies on this site We use essential cookies to make the site work. We would also like to set optional analytics cookies to see which guides help learners most. Nothing optional runs until you agree. See our [cookie policy](/cookie-policy). Accept allReject optionalManage cookies