§ 21-1412
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/md/transportation/21-1412A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
§21–1412.
(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.