Pressure is mounting on City Hall to install protected bike lanes on a one-kilometre stretch of road in Brisbane's west, which a cyclist advocacy group claims carries the most bicycle traffic in the city.

The CBD Bicycle Users Group blames Toowong's Sylvan Road thoroughfare for low numbers of female commuter cyclists on the city's west side, despite significant off-road pathways in the area, saying women choose not to cycle when they have to contend with traffic, even briefly.

More and more people are getting on their bikes in Brisbane. Credit:Ken Irwin

The group has been conducting audits during morning peak periods on Sylvan Road and says, in some sections, cyclists comprise a staggering 40 per cent of all traffic between 7am and 8am.

However, just 10 per cent of those on bikes – or four per cent of total traffic – are women, according to the group's co-convenor Donald Campbell, pointing to a dire need for enhanced safety along the stretch.