While the 21st century hasn't yet delivered on all the science-fiction promises of yesteryear, it has managed to make our driving experience a little more Knight Rider-esque. You can earn a speeding ticket for going faster than current weather conditions, such as fog, warrant, even if you're traveling at the posted speed. In addition, just knowing the speed limit isn't always enough.

For instance, in the United States, California's default highway speed limit is 65 mph, making it a good speed to drop back down to if you're in doubt. In many areas, you can always fall back on the standard default speed limit. The next thing you know, you're wondering if the speed limit is still 65 mph (105 kph) or if you missed a sign somewhere along the way. You take an interstate on-ramp or wind your way through crisscrossing rural roads. It's an easy situation to find yourself in. Naturally, the best way to avoid flashing blue lights and wallet-busting tickets is to stick to the car speed limit, but what do you do when you don't know it? Travel too fast and you'll attract unwanted attention from robotic speed cameras and police officers wielding radar guns. Travel too slow and you'll incur the angry honks of your fellow drivers.

There's safety in numbers, protection in conformity. It's easy to fall into a herd mentality out on the open highway.

Speed reader for car