These a have been on ambulances for years and are just starting to go mainstream. Too bad that in MN, you cannot have a pulsating light on any vehicle between 1,000 and 5,999 GVW that is not an emergency vehicle or escorting another qualified vehicle(oversized load, ect) so that pretty much means only motorcycles and semis up here. They do work though. Flashing lights grab your attention quicker and allow you to react jsut a tad faster. Sometimes, that's all the difference between an accident and a 'whoa that was close'.