Route 124 is a state highway in the northern part of New Jersey in the United States that is 14.74 mi (23.72 km) long. It is the eastern section of what used to be Route 24 before that road was realigned to its current freeway alignment. The western end is at an intersection with U.S. Route 202 (US 202) and County Route 510 (CR 510) in Morristown, Morris County; the eastern end continues as CR 603 on Springfield Avenue at the border between Maplewood and Irvington in Essex County. The route runs through suburban areas of Morris County, passing through Madison and Chatham. It interchanges with Route 24 on the border of Millburn, Essex County and Summit, Union County and serves as a frontage road for that route. Upon splitting from Route 24, Route 124 continues east through Springfield Township, Union Township, and Maplewood to its eastern terminus.

Route 24 is a 10.42-mile (16.77 km) freeway in New Jersey, United States, that begins at a junction with Interstate 287 (I-287) in Hanover Township in Morris County, passes southeast through Essex County, and ends at a junction with I-78 in Springfield Township in Union County.