If going straight at a t-junction there is no point in stopping for example. If at the lights and it's clear and there is a backlog of cars behind it is safer t

If going straight at a t-junction there is no point in stopping for example. If at the lights and it's clear and there is a backlog of cars behind it is safer to move off on the red light before the cars as to avoid being caught up in the mass of accelerating cars when the light turns green.