The A80 is a road in Scotland, running from the A8 to Moodiesburn, north east of Glasgow.

Prior to the M80 opening, the A80 was one of Scotland's busiest[citation needed] trunk roads.

The Stepps-Haggs stretch, built in the 1960s, was under-capacity in relation to the amount of traffic it carried[citation needed], and the lack of hard shoulders meant that a vehicle breakdown potentially could cause massive jams[citation needed] Despite long-term plans to replace the Stepps-Haggs section with a completed M80, the troublesome Auchenkilns roundabout in Cumbernauld was replaced by a grade separated junction in 2005 as traffic congestion meant it could not wait for the final upgrade (which at that stage, was still in planning).

[3] The Scottish Executive announced[4] in 2002 that the A80 would be upgraded to Motorway standard, replacing the A80 from Stepps to Haggs with the M80.

The Kelvin Valley route was not chosen[5] as it would have breached the Antonine Wall and destroyed the Castlecary Roman fort;[6] instead an on-line upgrade through Cumbernauld was selected.