An automatic non-variable audible alarm activated when the vehicle is in reverse shall be installed behind the rear axle and be at least 97 decibels.
Md. Code Regs. 11.19.03.23
Regulations .23 adopted effective April 19, 1999 (26:8 Md. R. 616)
Regulation .23 amended effective January 21, 2013 (40:1 Md. R. 20)