Md. Code Ann., Transp. § 12-409

If, as to any other jurisdiction, an agreement, arrangement, or declaration is not in effect as authorized by this subtitle, any vehicle registered or licensed in that other jurisdiction and for which evidence of compliance is supplied, shall receive, while operated in this State, the same benefits, privileges, and exemptions granted by the other jurisdiction to vehicles registered in this State. Reciprocity extended under this section applies only to vehicles that are engaged exclusively in interstate operations.