Which route crosses Belfast Lough between the M2 and the Bangor-bound A2?

The M3 and its Lagan Bridge/Sydenham connections carry traffic from the motorway network towards the A2 coastal road east of Belfast.

The M3 is not a direct road all the way to Bangor: after the harbour crossing you continue onto the A2 corridor. TrafficWatchNI has cameras for M3 Lagan Bridge, Dee Street and Sydenham Bypass, useful when deciding whether traffic is moving freely towards Holywood and Bangor.