What is the main Belfast-to-Derry route via Toome and Castledawson?

The A6 is the principal east–west route connecting the Randalstown/Toome side with Castledawson, Maghera and onward towards Derry.

From Belfast it links with the motorway network including the M2/M22. Unlike the Causeway Coastal Route, it is intended mainly for direct cross-country movement rather than sightseeing. TrafficWatchNI lists A6 cameras near Toome and Castledawson, so those are relevant points to check for disruption before a long journey.