The following information is updated periodically. However, laws and regulations can change between updates. State statutes and local ordinances are the ultimate authorities for these issues.

Speed Limits

Rural Interstates: Cars NA, Trucks NA
Urban Interstates: Cars 55, Trucks 55
Other Limited Access Roads: Cars NA, Trucks NA

(http://www.ghsa.org/html/stateinfo/laws/speedlimit_laws.html)

These speed limits apply unless a different limit is posted.

Speed limits are absolute--exceeding the speed limit is illegal per se (regardless of whether it was safe under the specific conditions).

Speed Limits Enforcement Techniques
Enforced through use of:
Pacing: Yes
Radar: Yes
Vascar: No
Automated Speed Enforcement: Yes
Aircraft: No
Laser: No

Ticket Payment Methods
Consult your ticket or clerk of courts

Trial By Declaration Allowed
No

Jury Trial Allowed
Speeding: Yes, if it goes beyond a "petty offense"
Parking: No
Equipment: No
DWI: Yes

Member of Nonresident Compact
Yes

Member of Driver License Compact
Yes

When and Where to File Accident Reports

Resident Insurance Requirements
Liability insurance is required (although some states allow posting a cash bond or such as an alternative)
Minimum Coverage Required:
Injury to one person: $25,000
All injuries: $50,000
Property Damage: $10,000
Uninsured motorist coverage is required

Phone Restrictions
Novice Drivers: All cell phone use prohibited for learners permit holders, using primary enforcement
School Bus Drivers: All cell phone use prohibited, using primary enforcement
All Drivers: Hand-held cell phone use and text-messaging prohibited, using primary enforcement
(http://www.ghsa.org/html/stateinfo/laws/cellphone_laws.html)

General Information
Telephone: (202) 737-4404 (option 3, Motor Vehicles), or http://dmv.dc.gov/main.shtm
Emergency Cellular Phone Number: Not publicized--try 911