Browse a clear reaction distance table to compare how far a vehicle travels before braking starts at different speeds in Portugal. This lookup format helps Portuguese driving theory learners review response time risk, strengthen hazard anticipation, and prepare for exam topics where early observation and correct reaction behaviour are essential to prevent avoidable road incidents.
Review reaction-distance values across common speeds to see how quickly response delay increases risk before braking begins. This preview helps learners in Portugal train rapid distance judgement, reinforce exam-ready response patterns, and develop safer approach-speed planning for crossings, merging conflicts, and limited-visibility situations.
At 80 km/h, your reaction distance is about 24 m before braking starts. For context, your stopping distance is about 88 m, including 64 m of braking distance.
24 m
Interpret this reaction-distance result to understand how attention delay, observation quality, and speed directly influence pre-braking collision risk. The explanation is designed for learners in Portugal who need practical judgement for hazard-perception theory questions, safer approach speed planning, and defensive driving decisions under time-critical traffic pressure.
24 m
Apply this simple conversion to estimate distance travelled during perception and pedal transition before braking force is applied.
64 m
Reaction distance rises directly with speed, so small speed increases can remove valuable decision time near crossings, junctions, and merging traffic.
44.4 m
Safety gap to the vehicle ahead, giving enough space to react and brake without rear-end collision risk.
This formula guide shows how speed translates into measurable pre-braking travel distance and why reaction timing is central to theory test hazard questions. Learners in Portugal can use these references to improve response strategy, reduce underestimation errors, and make safer judgement calls in complex traffic environments.
Reaction distance = speed × 3 ÷ 10
Apply this simple conversion to estimate distance travelled during perception and pedal transition before braking force is applied.
Speed 80 km/h → reaction distance grows linearly
Reaction distance rises directly with speed, so small speed increases can remove valuable decision time near crossings, junctions, and merging traffic.
Stopping distance = reaction distance + braking distance
Use reaction distance as the first safety layer and combine it with braking distance to assess full stopping requirements more realistically.
Review reaction-distance values across common speeds to see how quickly response delay increases risk before braking begins. This preview helps learners in Portugal train rapid distance judgement, reinforce exam-ready response patterns, and develop safer approach-speed planning for crossings, merging conflicts, and limited-visibility situations.
| Speed | Reaction distance | Reaction distance | Braking distance | Following distance | |
|---|---|---|---|---|---|
| 20 km/h | 6 m | 6 m | 4 m | 11.1 m | Open reaction result |
| 30 km/h | 9 m | 9 m | 9 m | 16.7 m | Open reaction result |
| 50 km/h | 15 m | 15 m | 25 m | 27.8 m | Open reaction result |
| 80 km/h | 24 m | 24 m | 64 m | 44.4 m | Open reaction result |
| 100 km/h | 30 m | 30 m | 100 m | 55.6 m | Open reaction result |
| 120 km/h | 36 m | 36 m | 144 m | 66.7 m | Open reaction result |
Use these related calculator tools to compare stopping distance, reaction distance, and following distance for safer decisions and stronger exam preparation in Portugal.
Utilize the powerful search tool to refine your Portuguese driving theory practice. Pinpoint questions related to specific traffic laws, road signs, or complex scenarios from the Código da Estrada. Begin targeted revision now to boost your understanding and confidently approach your IMT driving exam.
Search Practice Questions by Topic