Final answer:
When entering traffic from a parking spot, you should wait for a large enough gap to get up to the speed of traffic. In order to cross the road safely, you should be able to walk at least 2 meters further than the width of the car before it reaches you. Calculating the time for a car to merge into traffic on a ramp can help traffic engineers.
Step-by-step explanation:
When you enter traffic from a parking spot, you should wait for a large enough gap to get up to the speed of traffic. In order to cross the road safely, you need to be able to walk further than the width of a car, before that car reaches you.
To cross safely, you should be able to walk at least 2 m further than the width of the car (4 m in total), before the car reaches you. An example of calculating the time for a car merging into traffic on a ramp can also provide useful information to a traffic engineer.