How far does an oncoming car have to be before it becomes dangerous for you to cross the road in front of it?

Question

If you were to cross the road at the front of the school to boulders heights path; Where would a car be for you to safely cross the road if the car was heading down Haig crescent towards Princep street?

Everyone will mark off what they consider to be the safe distance for 40 km/h and 60 km/h and record these at the start of the activity e.g. 15 slabs up. Near the crack in the kerb, level with the tree / entrance to the parking area etc. Don’t measure your distance at this stage.

Answer 1

1.  Assume 'lane' is 5 meters across and the car will not react to you crossing.

2.  You walk at 5 kps

3.  The car is traveling at 100 kph.

You walk 1000 meters/kilometer X 5 kph X 1hour/3600 seconds. = 1.4 meters/second

the car is traveling 20 times faster or 27.8 mps.  

you are in the lane for 5 meters, or 5/1.4 seconds = 7 seconds.

The car has to be greater than 7 seconds from you when you start walking or it will hit you.  7 seconds X 27.8 mps =  195 meters - that can be ratio'd according to the car's assumed speed.  (50kph would be half, etc...)

Answer 2

it depends on how fast its moving and how agile you are