Operations and Maintenance maintains about 1,300 miles of roadway, from urban arterials carrying more than 40,000 vehicles per day to dead-end local streets carrying fewer than 100. This includes more than 3,000 culverts and nearly 200 bridges.
Roadway surface maintenance includes:
road maintenance –Grading the existing surface and placing additional crushed
rock where needed to improve smoothness and allow water to flow off the road.
- Pothole repair –Filling in sections of pavement that have deteriorated and collapsed.
- Machine patching –Treatment for deteriorated paved surfaces. Hot mix asphalt concrete is machine placed and compacted to provide a repair usually lasting five to 10 years.
- Surface stabilization –Placement of an environmentally approved soil stabilization agent on short segments of selected gravel roads (generally on steep grads) to reduce severe surface roughness (wash boarding).
- Crack seal –Treatment to repair localized cracking on paved-road surfaces. Prevents water from entering and damaging the road base, thereby extending the life of the road three to five years.
- Chip seal –Treatment for paved surfaces consisting of a layer of crushed rock placed on top of a layer of emulsified asphalt and then compacted. It extends pavement life about seven years.
- Sweeping –Removes debris from the roadway and bike lanes.
- Striping –Replaces worn-out painted yellow-and-white long-line traffic stripes on roads.
Maintenance activities are outlined in the Department of Land Use & Transportation's Annual Road Maintenance Program.