## modelling for designing a pedestrian crossing

This question has been asked before but no clear guideline on how to tackle it were provided, please help me.A two lane road has been made one-way to create additional parking. Parking is allowed on the LHS, whilst traffic is free to move on the RHS. Most of the parking space is occupied during the day and pedestrians are finding it difficult to cross the road safely.

A pedestrian crossing will be installed to help with this and zigzag lines will extend before the crossing to indicate no parking. This helps approaching traffic view if anybody is waiting at the pedestrian crossing. The drivers vision is obscured if a car is parked too close to the crossing.

The problem is to find how far the no parking zone lines should extend before the crossing. There is still a shortage of parking, so while the no parking lines should be long enough to achieve safety, they should not be longer than necessary.

I'm assuming the stopping distance will be needed here, d=kv+lv^2 (k,l are constants). What about geometry for vision?