The speed limit on St Kilda Road should be dropped permanently to 40 kilometres an hour, an inner city council has told an inquiry into the proposed Metro rail tunnel.

And Port Phillip Council also believes there is an "embarrassing" number of bicycle parking spots to be included in the proposed Domain metro station.

The council's development manager Claire Ferres Miles on Wednesday morning told the hearing into the $11 billion rail tunnel's environmental effect that the speed limits on the road should be dropped permanently when the project is complete.

St Kilda Road is mostly 60kmh, although the section from the National Gallery of Victoria to Princes Bridge is 50kmh, and from the bridge to Flinders Street it is 40kmh.