This road still carries local traffic, but has now been replaced for long distance traffic by the M4 motorway, which closely skirts the borough and serves it with three junctions, J10-J12. Other main roads serving Reading include the A33, A327, A329, A4074 and A4155. Within Reading there is the Inner Distribution Road (IDR), a ring road for local traffic. The IDR is linked with the M4 by the A33 relief road. National Express Coaches run out of Reading Coachway, at Junction 12 of the M4. The Thames is crossed by both Reading and Caversham road bridges, while several road bridges cross the Kennet, the oldest surviving one of which is High Bridge.