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Unlike other shiny surfaces, which reflect light according to the angle of the light emitting source, road signs are designed to reflect light in all directions, no matter what angle the source of the light is approaching from (as long as it reaches the sign). This makes them more visible from any and every direction.

A stop sign costs about $50, and a neighborhood street sign is around $15 (depending on the length). A two-sided metal sign that is 18 x 24 can start about $75, not including installation.

It is no coincidence that the Federal Highway Administration (FHWA) and all 50 state Department of Transportation and all highway departments require aluminum signs for all traffic and parking signs.

Typically around 7-8 feet above ground, these heights insure better visibility and make it harder to vandalize the signs. It is recommended that street signs be high intensity reflective and lettered using upper-case and lower-case letters.

The earliest Greek known to have made a map of the world was Anaximander. In 6th century BC, he drew a map of the then known world, assuming that the earth was cylindrical. The first Greek to draw a world map using the assumption of a spherical earth was Eratosthenes.

Types of road signs: 1) Traffic Signs. 2) Red and White Regulatory Signs. 3) Warning Signs. 4) Highway Construction and Maintenance Signs. 5) Service Signs. 6) Guide Signs.