Md. Code Ann., Transp. § 11-203
The Maryland Vehicle Law does not have a retroactive effect and does not apply to any traffic accident, to any cause of action or judgment arising out of a traffic accident, or to any violation of the vehicle laws of this State occurring before July 1, 1977.
Added by Acts 1977, c. 14, § 2, eff. July 1, 1977.
Formerly Art. 66 ½, § 19-104.