The curious truck accessory may have caught your eye on the road. Here's how a tiny plastic strip keeps drivers safe.
The plastic arrows on the wheels of trucks and buses serve an important purpose.
Unlike the brightly colored balls on power lines, those random "tree chunks" don't serve a practical purpose.
UPS trucks do have passenger doors, but you almost never see them closed—for a good reason.
You think Washington, D.C.’s metro escalators are long? Wait ’til you hear about St. Petersburg’s.