 MD 23 is an L-shaped highway in northwestern Harford County that consists of two major sections.Between US 1 and MD 165 in Jarrettsville, MD 23 is marked east–west along a two-lane controlled access road named East–West Highway.From MD 165 to the state line, the state highway is marked north–south along Norrisville Road, a rural two-lane highway that passes through the villages of Madonna and Shawsville.