@boredman, there are lot of idiots on the road, who change lanes while having their fog lights on...meaning that the person behind is not getting the proper indication from the car in front and don't know what they might do. Driver in front with hazard light on, may have put the indicator to change lane (due to common driving habits), but may have forgotten that he has been having his hazard lights on whole time, so while changing lane, he may not have signal the driver at the back properly...the driver at the back may have been on course and starting to speed and that idiot driver makes a sudden change in lane, which may cause accident or push the driver out of lane. Now do you understand the danger!