The M49 begins at junction 18A of the M5 and then heads roughly north and northwest before it reaches its terminal junction with the M4 at junction 22, just before the Second Severn Crossing at Pilning Interchange. It cuts journey times for traffic to and from
Avonmouth docks, Central and southern Bristol and
South West England. Compared to driving via the M4/M5 interchange, using the M49 cuts the distance travelled by 6.2 miles. Having a two-way
grade separated roundabout junction with the M4, it also fulfils the additional role of providing a bypass for the busy stretch of the M5 between the
Avonmouth Bridge and the M4 in case of that route being shut. Original plans provided for an intermediate junction with the
A403, to serve an expanded industrial area and
Severn Beach. Construction of Junction 1 commenced summer 2018 and was completed late in August 2020. Despite this, the junction is not currently connected to the local road network, so cannot be used to access the motorway. The M49 is
anomalously numbered, as it is entirely to the south of the M4 and should therefore begin with a 3. == Junction 1 link road dispute ==