A is turning left. In this case, B is permitted to pass on the right.
Overtaking is prohibited here, as you would have to cross the centre line on a bend with obscured visibility. This applies even though the centre line is not continuous.
The white car has performed an illegal overtaking manoeuvre (solid centre line). You have obligations in this situation. You may not increase your speed or do anything to obstruct the passing car.
The time gained from overtaking is often minimal. This means that many overtaking manoeuvres are unnecessary, in relation to the risks involved. The time gained per 10 km can generally be said to be:
If you are driving at 100 km/h and increase your speed to 110 km/h, how much time will you gain per 10 km travelled?
Original speed | 100 km/h |
New speed | 110 km/h |
Minutes per hour (as the speed is measured in km/h – kilometres per hour) | 60 min |
Number of kilometres | 10 km |
First calculate how many minutes it takes to travel 1 km at both speeds:
It therefore takes slightly less time at the higher speed. The difference is:
However, the question is how much time you will gain per 10 km, not per km. Therefore, recalculate the time gained per 10 km:
It is easier to understand if the answer is recalculated to seconds:
Original speed | 100 km/h |
New speed | 110 km/h |
Distance | 10 km = 10,000 metres |
Fixed conversion rate km/h to m/s | 3.6 |
Formula for calculation of time:
For the formula to work, you must use metres instead of kilometres, and metres per second (m/s) instead of kilometres per hour (km/h). The speeds are therefore recalculated to m/s:
Only now can you use the formula Distance / speed = time:
You can then work out the time difference between both speeds: