The highway runs 6.90 miles (11.10 km) from US 1 and Maryland Route 147 (MD 147) in Benson north to US 1 near Hickory.

crosses Winters Run at a place known as Lake Fanny Hill just to the north of a loop of old alignment that uses US 1's original bridge over the stream.

intersects MD 24 (Vietnam Veterans Memorial Highway) surrounded by shopping centers, including the Harford Mall on the northwest corner.

The business route intersects Bond Street, which carries southbound MD 924, and becomes one-way eastbound.

turns north onto Main Street, where the business route runs concurrently with northbound MD 924.

The business route also passes by Odd Fellows Lodge, Bel Air Armory, and the Graham-Crocker House.

North of downtown, the two directions of the business route come together at Gordon Street, which heads east past Proctor House and west to the historic estate Liriodendron.

At the northern limit of Bel Air, the business route intersects Moores Mill Road, which heads east toward Heighe House.

The business route intersects the old alignment of the state highway, Jarrettsville Road, adjacent to St. Ignatius Church, then veers east through the center of Hickory.

That project included the construction of a new bridge over Winters Run at Lake Fanny Hill the same year.

[5] After incremental improvements to the road at Lake Fanny Hill in the late 1910s proved insufficient, the present bridge was constructed over Winters Run and the dangerous curve was bypassed in 1930.

[7] Widening of Belair Road to 30 feet (9.1 m) from Baltimore County to downtown Bel Air was underway by 1934 and completed in 1936.

and Tollgate Road in Bel Air, a bomb exploded in the car of two friends of H. Rap Brown, who was set to appear in court in the town facing charges of inciting a riot in Cambridge.