The Clem7 provides two lanes of traffic in each direction via parallel tubes.
The tunnel provides four lanes for traffic, two in each direction, separated by a full-height concrete wall.
The tunnel provides 2 lanes of road going in each direction, and a separate pedestrian tunnel.
It is used twice a day to provide four lanes for heavier traffic and three lanes in the opposite direction.
This section would provide three lanes in each direction.
Crossing the bay, the bridge and the connecting highway will provide three lanes of traffic in each direction.
The tunnel will provide three lanes of traffic, and will be 440 m long.
At first it is a small four-lane street, but in the downtown area it provides six lanes.
The bridge was duplicated in 1980, providing two lanes each way.
The scheme will provide three lanes for traffic wishing to join the A34 southbound from the M40.