MD 318 heads east as Preston Road, a two-lane undivided road that intersects Langrell Road and Beulah Road a short distance east of its western terminus. Langrell Road is unsigned MD 817B, which follows the county line west to a dead end at Hunting Creek.
MD 318 heads east as Preston Road, a two-lane road that intersects with Langrell Road and Beulah Road near its western endpoint. The local designation of Langrell Road is MD 817B, which follows the county boundary west until it reaches a dead end at Hunting Creek.