Md. Code Ann., Transp. § 24-103

(a) A passenger-type vehicle may not be driven on any highway while carrying any load that extends beyond the line of the fenders on the left side of the vehicle.

(b) A passenger-type vehicle may not be driven on any highway while carrying any load that extends more than 6 inches beyond the line of the fenders on the right side of the vehicle.

Official source: Maryland General Assembly. Reproduced from public-domain Maryland statutes; confirm against the official source for the current text. Not legal advice.