Maryland Code, General Provisions § 4-321

(1) a traffic control signal monitoring system operated under § 21-202.1 of the Transportation Article;

(2) a speed monitoring system operated under § 21-809 of the Transportation Article;

(3) a work zone speed control system operated under § 21-810 of the Transportation Article; or

(4) a vehicle height monitoring system operated under § 24-111.3 of the Transportation Article.

(1) as required in § 21-202.1, § 21-809, § 21-810, or § 24-111.3 of the Transportation Article;

(2) by any person issued a citation under § 21-202.1, § 21-809, § 21-810, or § 24-111.3 of the Transportation Article, or by an attorney of record for the person; or

(3) by an employee or agent of an agency in an investigation or a proceeding relating to the imposition of or indemnification from civil liability under § 21-202.1, § 21-809, § 21-810, or § 24-111.3 of the Transportation Article.