Free Driving Theory Practice Test & Stopping
Practice official driving theory test questions with instant feedback and explanations. Calculate wet/dry braking distances and test road sign awareness.
What is the legal minimum tire tread depth for passenger cars?
🚙 The 2-Second Rule vs The 4-Second Rule
In normal dry weather conditions, drivers must leave at least a 2-second gap behind the vehicle ahead. When the road is wet or raining, double this cushion to a 4-second gap. On ice, stopping distances multiply by up to 10 times, requiring downshifting and extreme anticipation.
About this tool
How to use it
- Select your practice mode: 'Mock Theory Test Quiz' or 'Stopping Distance Calculator'.
- Filter quiz questions by topic (Road Signs, Speed & Stopping, Hazards & Safety, or All Mixed). Each attempt draws a fresh, shuffled set of 20 questions from a bank of 100, so retrying gives you a different run.
- Click any multiple choice option to receive instant grading and full official Highway Code explanations.
- Use the Stopping Distance Calculator slider to observe how rain (2x) and ice (10x) exponentially increase braking length.
Why it matters
Over 50% of first-time driving candidates fail the theory examination due to tricky questions on tire tread depth, right-of-way at unmarked junctions, and stopping distance calculations. Practicing with instant feedback builds muscle memory before exam day.
When to use it
Use this tool when preparing for official driver theory tests, learner permit exams, or refreshing highway safety rules.
Good to know
Stopping distance physics models align with standard Department of Transport (DfT) and Highway Code braking friction coefficients.
Common questions
What score is required to pass the driving theory test?
The standard pass mark is 86% (answering at least 43 out of 50 multiple choice questions correctly within 57 minutes).
How does rain affect stopping distance?
Wet road surfaces reduce friction between tire rubber and asphalt, effectively doubling (2x) total braking distance and requiring at least a 4-second gap.
How does ice affect braking distance?
On ice and hard-packed snow, vehicle stopping distances can increase by up to ten times (10x) compared to dry conditions.
What is the legal tire tread depth?
The legal minimum tread depth across the central three-quarters of the tire breadth is 1.6 mm throughout the entire circumference.