Massachusetts Route 30

Route 30
Route 30 highlighted in red
Route information
Maintained by MassDOT
Length	36.3817 mi[1] (58.5507 km)
Existed	1933–present
Major junctions
West end	Route 122 / Route 140 in Grafton
Major intersections	Route 135 in Westborough Route 9 in Westborough Route 85 in Southborough Route 9 in Framingham Route 126 in Framingham I-90 / Mass Pike in Framingham Route 27 in Wayland I-90 / Mass Pike / I-95 / Route 128 in Weston Route 16 in Newton
East end	US 20 in Boston
Location
Country	United States
State	Massachusetts
Counties	Worcester, Middlesex, Suffolk
Highway system
Massachusetts State Highway System Interstate US State
← Route 28 → Route 31

Route 30 is a 36.3817-mile-long (58.5507 km) east–west arterial route, connecting Grafton with Packard's Corner in Boston. Route 30 runs roughly parallel to the Massachusetts Turnpike and Route 9, but unlike those two larger highways, takes a more meandering path from town to town. Between Boston and the Charles River it is known as Commonwealth Avenue, along most of this route is part of the course of the Boston Marathon.

Route 30 has two interchanges with the Mass Pike, at Exits 13 in Framingham and 14/15 in Weston; the latter also includes the junction with Interstate 95 (Route 128). It also has two interchanges with Route 9, one in Westborough and one at the Southborough-Framingham border (where the two highways have an interchange without actually crossing), as well as a section further east in Framingham that runs concurrently with Route 9, for a total of four junctions between Routes 9 and 30.