MD 410 by 1930. An automatic traffic light was installed at its intersection with Connecticut Avenue in November 1931. Most of MD 410 was built on a new alignment with the exception of the part between present day MD 186 and Jones Mill Road, which followed the old Brookville Road. By 1933, the new state highway was the busiest road in Montgomery County. The road, which became known as East-West Highway, was originally built with a width of 20 feet, but the heavy traffic led the Maryland State Roads Commission (SRC), the predecessor of MDSHA, to suggest in 1934 that the road be widened to 40 feet in the near future. The SRC also recommended extending East-West Highway through Silver Spring and Takoma Park to Hyattsville. By 1935, the highway was extended along a new alignment east from 16th Street to Takoma Park, then placed on Philadelphia Avenue and Ethan Allen Avenue within Takoma Park. The extension to MD 212 in Hyattsville was completed in 1936. After World War II, MD 410 was extended even further east and saw significant improvement on its extant sections. By 1946, MD 410 was extended over Hyattsville's Ager Road, Hamilton Street, 38th Avenue, and Jefferson Avenue–roads then designated MD 209–to a new eastern terminus at US 1 in Hyattsville. In addition, the pre-1946 course saw completion of efforts to widen the road to 40 feet. The highway between Connecticut Avenue (then MD 193) and Georgia Avenue (US 29) was widened in 1946 and 1947. In 1950, two segments were widened: Wisconsin Avenue (US 240) to Connecticut Avenue (MD 193), and MD 650 (New Hampshire Avenue) in Takoma Park to US 1 in Hyattsville. Beyond minor improvements, the configuration of MD 410 in Montgomery County has remained much same since 1950. The only major change was the highway being split onto a one-way pair of streets in Bethesda in 1988. The Prince George's County section has seen more substantial changes over the intervening decades. The first major change in alignment occurred in 1956, when MD 410 was completed on a new alignment as a four-lane divided highway between Ager Road (just east of MD 212) and MD 500. MD 410 was subsequently extended east over the former MD 403 (Colesville Road), which ran between MD 500 and US 1 in Riverdale. By 1970, this segment was upgraded to a multi-lane divided highway. Then, between 1967