Thanks for the quick responses guys!!
The road was straight, however there was one of those concrete lil islands straight after the van which i nearly ran up on..
it was more just the unexpected shock, the flash only happened just as i passed the van, i thought i might have hit a door or something, i was driving a grandaddy honda accord my skyline days are well and truely gone, i know speeding is speeding and its "breaking" the law, i just driving to the conditions of the road.
BTW, does squizz still visit the forums ??