Renfrewshire Council has called on the Scottish Government to upgrade the A737 road.
Councillors voted to call for improvements including dualling the route between Kilbarchan and Dalry, as well as the creation of an additional slip road lane at the Johnstone exit and a new slip road at the Howwood exit.
The motion also urged the government to create of a footbridge and small car parking area at the Roadhead Roundabout in Lochwinnoch.
Renfrewshire Council Leader Mark Macmillan said: “The A737 is a key route for west Renfrewshire and it is time the Scottish Government finally stepped-up to deliver these much-needed improvements.
“People using this road face heavy congestion so extending the dual carriageway would make a real difference by reducing journey times.
“This and the other upgrades we have called for would and strengthen links between communities in Renfrewshire and Ayrshire, making travelling much easier for residents and supporting the local economy by giving businesses better access to their customers.”
He added: “Renfrewshire Council’s commitment to delivering major infrastructure projects is clear, but we need the Scottish Government to play its part.
“Under the City Deal we have taken forward infrastructure projects that better connect Renfrewshire with the rest of the Glasgow City Region, but as the A737 primarily links to Ayrshire it falls to the Scottish Government to deliver theses upgrades.
“It is high-time they followed our lead and delivered the transport improvements the people of Renfrewshire deserve.”
The motion calling for improvements to the A737 was passed by councillors from across Renfrewshire at a full meeting of the authority in Paisley last Thursday (15 December).