Smart Motorway gantry sign
A gantry structure spanning the motorway with electronic signals, blue signs showing an exit and the following text.
Exit destinations: A4018 Bristol (W) [Hollow square diversion symbol]; Cribbs Causeway .
Forward destinations: The SOUTH WEST; Bristol [Airport symbol] , Avonmouth M5 [Solid diamond diversion symbol] .
Junction number: 17.
The A4018 will get you to the centre of Bristol, eventually - but on the way it will acquaint you with some of Bristol’s fine western suburbs and parks, including the dramatic Clifton Down and the folly at Blaise Castle.