(a) Except at the direction of authorized personnel, vehicular traffic may not cross the double white lines that designate the vehicular traffic lanes in a tunnel.
(b) Except at the direction of authorized personnel, trucks and slow moving vehicles may be driven only in the right lane of a tunnel.
(c) The driver of a vehicle may not sound his horn or flash his headlights in a tunnel.
(d) While in a tunnel, a person may not use any cutout or other device that allows exhaust gases to escape a motor without passing through a muffler or silencer.
Structure Maryland Statutes
Title 21 - Vehicle Laws -- Rules of the Road
Subtitle 14 - Operation of Vehicles on Certain Toll Facilities
Section 21-1402 - Application of Other Provisions to Vehicular Crossings
Section 21-1403 - Rules and Regulations for User Safety
Section 21-1404 - Traffic to Comply With Signs, Orders, Etc
Section 21-1405 - Pedestrians and Bicycles Prohibited
Section 21-1406 - Hitchhiking and Pickup or Discharge of Passengers Prohibited
Section 21-1407 - Stopping, Standing, or Parking Prohibited; Exceptions
Section 21-1408 - Prohibited Turns
Section 21-1409 - Compliance With Posted Minimum Speeds
Section 21-1410 - Size, Weight, and Load of Vehicles
Section 21-1411 - Transportation of Hazardous Materials
Section 21-1412 - Special Provisions for Tunnels
Section 21-1413 - Failure or Refusal to Pay Toll
Section 21-1414 - Failure to Pay Electronic or Video Toll
Section 21-1415 - Reciprocal Enforcement of Toll Violations Between Jurisdictions
Section 21-1416 - Reporting of Transponder Theft and Unauthorized Charges on E-Zpass Account