Though not legal in many states, this bad boy can give you the peace of mind that makes the open road open up even further. Luckily most of them come with cloaking technology that keeps you one step ahead of the officers looking to put a price tag on your speedometer. So for those of you into shaving time between points of interest, lather up.

Complex recommends: Beltronics Vector 940 for ease of use, large display and superior range, or the affordable Whistler XTR-140 for small size, smart modes, and the fact that it looks like a pager.