The M74 Completion is expected to alleviate congestion on the M8 and local road network, reduce journey times and improve road safety.
This project complements other proposed major road and rail projects in west-central Scotland which will improve transport links providing a better service for transport users
Once complete the motorway is expected to produce immediate benefits by:
| Journey | Current Journey Time | Time Saving |
| Hamilton to Glasgow Airport | 30 mins | 12 mins |
| Glasgow Airport to Euro Central (Mossend) | 27 mins | 6 mins |
| Kilmarnock to Cumbernauld | 41 mins | 5 mins |
Savings in personal and freight travel times will generate substantial economic benefits.
The motorway will provide an alternative route across the south of Glasgow and South Lanarkshire and so will help reduce traffic on many local roads over a wide area.
Examples of local traffic reductions:
| Location | Percentage Traffic Reduction (%) |
| Rutherglen Main Street | 15% |
| Cathcart Road (north of Aitkenhead Road) | 12% |
| Calder Street | 12% |
| Dalmarnock Road | 10% |
| London Road (east of Parkhead Cross) | 10% |
Traffic reduction on local roads will:
There will be increases in traffic on a limited number of local roads, primarily near to new junctions. Where this occurs, traffic calming and traffic management measures will be implemented, where appropriate, to mitigate any adverse impacts on adjacent roads.
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