Quick road sign facts
State Highway
- Roads with route numbers are owned and maintained by the Maryland State Highway Administration.
- Odd numbered highways run north and south.
- Even numbered highways run east and west.
Interstate system
On the interstate system, any three-digit number beginning with an even number, like I-495 and I-695, will travel in a circle around a metropolitan area and return to the main thoroughfare.
Road lines
- Yellow road lines are always on your left when driving; they are used to separate traffic.
- Solid white edge lines mark the pavement to the right - "Keep White on Right."
Sign colors
- Construction and maintenance signs are orange and black.
- Guide signs are green and white.
- Informational signs are blue and white.
- Regulatory signs are red and white or black and white.
- Warning signs are yellow and black.