An average of 77,320 vehicles have travelled daily on the Airport Link tunnel between Bowen Hills, Kedron and the Brisbane Airport during its first week of trading.

However brisconnections unit prices have dropped more than 13 per cent, from $1.06 to 92 cents a share - albeit on very small sales (32,000 units) in the first week.

The 77,320 vehicles is a seven-day a week average figure, with more motorists using the tunnel from Monday to Friday and fewer vehicles over the weekends.

In the first week, slightly more than 85 per cent (85.3 per cent) of the traffic was private cars, about 10 per cent were light commercial vehicles and about three per cent were heavier trucks.

Motorycles made up 1.3 per cent of the vehicles using the tunnel.