Originally Posted by Geekybiker

One thing I learned on my motorcycle (sorry spent alot more time on it than cycling in traffic) is that drivers look for *threats* not other vehicles. Threats being other cars/trucks. While motorcycles don't have the speed discrepancy problems, they do have the visibility and lane issues. Heck even in my car I find that most drivers don't judge the speed of vehicles in other lanes very well. They look once for half a second and assume if nobody in in that spot then, nobody will be there in the time it takes to complete their turn/merge.