Can a driver use the A37 Coleraine Mountain route instead of the A2 coast road?

Yes, the A37 is an inland Coleraine Mountain road connection, while the A2 runs along the wider Coleraine–Limavady coastal-side corridor.

The choice depends on the exact start and destination rather than any universally faster route. Because the A37 passes higher ground, weather and visibility may affect conditions differently from roads closer to sea level. TrafficWatchNI includes an A37 Coleraine Mountain camera; use it and official advisories before taking that route in poor weather.