|Length:||40.6 miles (65.3 km)|
|Meets:||A8, A770, B7054, B7025, A760, B782, B7048, B781, B7047, A738, B780, B714, A738, B779, A737, B7080, A71, B7080, A759, B746, A79, A77|
|Old route now:||A770, A738, A737|
|Route outline (key)|
The A78 is a major road that runs between Greenock and Monkton via Irvine. Hugging close to the Firth of Clyde it is a road of two halves. The northern section is mostly unimproved though the various towns and villages of the route while the southern half is a D2/D3 high standard dual carriageway.
Over the years the A78 has had many improvement over the years. The biggest change was a rerouteing of the northern end of the road in 1985. Most of the improvements though are on the southern section of the road starting from the Three Towns.
Notable locations and improvements
Bankfoot Roundabout is where the A78 used to TOTSO before the 1985 rerouteing. Originally a T-junction and later a D2 T-junction, in 2005 it was upgraded to a roundabout and made the junction far safer.
The Rothesay ferry is the southern Ferry for the Isle of Bute. It is by far the busier of the two as it docks by Wemyss Bay railway Station. The crossing takes 35 minutes.
The Cumbrae Ferry is the sole crossing to Great Cumbrae Island. Accessed via the B7025 it is a short 10 minute ferry and is a busy route.
The Newhouse Interchange marks the end of the Irvine bypass. Built in the 1970's, it is a busy roundabout.
|2005||Bankfoot Roundabout||Junction rebuilt to roundabout|
|2004||Three Towns Bypass||S2+1/D2 bypass of the Three Towns|
|1985||Spango Valley||Road rerouted onto old A742.|
|1976||Irvine Bypass||D2/D3 bypass of Irvine.|