Since Philadelphia is arranged on a grid system, the mostly one-way roads are easy to navigate. Helpful maps are posted along street corners across the city – watch for the "Walk! Philadelphia" signs ...

The second-largest city in the Lone Star state, San Antonio is located on the southern edge of the mountainous Texas Hill Country. Its streets follow old Spanish trails and 19th-century wagon trails ...

Abstract: Humans have a natural ability to effortlessly comprehend linguistic commands such as “park next to the yellow sedan” and instinctively know which region of the road the vehicle should ...