Can anyone explain how this works, it baffles me a bit, I know a lot of conditions have to be met for it to kick inbutfor example I leave the car park Engine cold)at work travel 600 yards to traffic lights car stays running, i would expect this as the engine has just been started, then travel 400 yds to more lights isg cuts in and stops car ???, lights change travell 600 yds to next lights no isg kicking in this continues to be the case through various lights and junctions for the next 3miles then the last set of lights before home isg kicks in again ? and this hashappened more than once, why does it work like this surely if conditions are met after first 1000yds or so and no extra load put on system ie lights ,air con etc then it should continue to stop at lights etc. anyone any ideas or similar experience.