A new road bridge could be built over the River Avon as part of submissions to the Greater Bristol transport study.
The low-level bridge will relieve the M5 Avonmouth bridge of local traffic and also reduce the impact of incidents which cause major traffic congestion.
The bridge or barrage, which could be opened, will also carry a rapid transport link to Portishead.
The study also includes a number of measures to "strongly encourage" alternatives to car travel.
South Bristol ring road between A4 and A38
A38 A370 link road
Links between south Bristol and M5
Improvement to Weston-super-Mare motorway junction
Widening M4 between jct 19 and jct 20
Improving M5 jct 16/17 and M32 jct 1 area
A36 to A46 Link Road
Stoke Gifford Bypass
The Greater Bristol Strategic Transport Study (GBSTS) funded by the government and local councils, looked in depth at the future of the main transport routes and movement of people in the area over the next 30 years.
The final recommendations have now been handed over to the Government Office for the South West and other study stakeholders for their consideration.
They will develop recommendations on which schemes and measures should now be taken forward along with a potential timetable for their implementation.
Among its recommendations the GBSTS also suggests:
Reducing the number of parking spaces and increasing parking charges, introducing workplace parking charges and road charging to cut the number of car trips.
Measures to improve public transport from improvements to bus services through to an expansion of the rail network.
Extensions to the park-and-ride system. Expansion at the existing sites in Bristol and Bath to increase capacity and improve the facilities.
Measures to improve the region's road will concentrate on making the best use of existing resources before looking at schemes to increase highway capacity.
Looking at the growth of passenger and employee numbers at Bristol International Airport