Final answer:
To safely cross the road, you must return to your driving lane before coming within 4 meters of any approaching vehicle.
Step-by-step explanation:
In order to safely cross the road, you need to return to your driving lane before coming within 4 meters of any vehicle approaching from the other direction. The width of the average car is 2 meters, so you should be able to walk 2 meters further than the width of the car before it reaches you.