 The six-lane freeway narrows into a four-lane undivided highway shortly before the approach ramps to the Bourne Bridge.Route 25 is concurrent with Route 28 from Exit 3 until the US 6 underpass, at which point the Route 25 designation officially ends; the two eastbound lanes of Route 25 continue as Route 28 south over the Bourne Bridge and the Cape Cod Canal and onto Cape Cod.Route 28 continues southward to the town of Falmouth and then eastward to Hyannis and Orleans.