In Elmwood Center, it turns west onto New Britain Avenue, and turns north again onto South Main Street as it meets the northern end of Route 71, onto which New Britain Avenue continues.

[1] A section of Route 173 in West Hartford from the Newington town line to SR 529 is designated the Roger Fissette Hannon-Hatch VFW Post 9929 Memorial Highway.

[3] A section from SR 529 to South Main Street in West Hartford is designated the Trooper Carl P. Moller Memorial Highway.

[2] It originally went using South Quaker Lane to Farmington Avenue (then Route 4) in West Hartford.

However, in 1969, it was re-extended slightly to I-84 along South Main Street (former SR 569) via a short overlap with Route 71.