U.S. Route 111 (US 111) was a U.S. Highway that extended from Baltimore, Maryland north to the Harrisburg, Pennsylvania area. It replaced part of the Susquehanna Trail, partially signed as Pennsylvania Route 4, and was in turn replaced by Interstate 83 (I-83). Portions of its pre-freeway alignment are now Maryland Route 45 and I-83 Business (I-83 Bus.). Other old sections in Pennsylvania are now unsigned Quadrant Routes or township-maintained roads. US 111 extended north to the Pennsylvania–New York state line where U.S. Route 15 now crosses it between 1928 and 1937. Route description This route description features US 111 as it existed in 1945, with references to today's highways to provide context. Maryland The Maryland portion of US 111 followed the entire length of what is now MD 45 from Baltimore to Maryland Line. The highway began at US 1 (North Avenue) and followed Greenmount Avenue north to 42nd Street, where the highway's name became York Road through the rest of Baltimore and all of Baltimore County. US 111 left Baltimore and continued to Towson, where the highway entered downtown by passing under the Maryland and Pennsylvania Railroad at the modern MD 45–Towsontown Boulevard intersection. In the center of the county seat, where Towson Circle now sits, the U.S. Highway intersected the southern end of the original MD 144 (Dulaney Valley Road), which is now MD 146; the western end of MD 148 (Joppa Road); and the eastern end of MD 141 (Allegany Avenue). US 111 continued north through Lutherville, where the route met the eastern end of MD 131 (Seminary Avenue), and Timonium. In Cockeysville, the highway met the western end of MD 143 (Warren Road) and passed under the Northern Central Railway at an oblique angle, but did not intersect MD 145 (Ashland Road), which did not yet extend west of Loch Raven Reservoir. US 111 passed through Hereford, where the highway met MD 137 (Mount Carmel Road) and MD 138 (Monkton Road), before crossing Gunpowder Falls and meeting the west end of MD 142 (Wiseburg Road). The U.S. Highway passed through Parkton, where the highway followed its present course over the Northern Central Railway, which is now the Northern Central Railroad Trail. US 111 entered Maryland Line at its acute intersection with MD 439 (Old York Road). The U.S. highway met the eastern end of MD 409 (Freeland Road) before crossing the Mason–Dixon Line into Pennsylvania. Pennsylvania