Perth's inadequate bicycle network is endangering cyclists and needs immediate and dramatic improvement, according to the Greens.

In their submission to the Auditor-General's investigation into WA's bike infrastructure, Senator Scott Ludlam and MLC Lynn MacLaren said with the right investment and commitment, there was no reason why Perth could not be one of the world's best bike cities.

But the State Government had shown a lack of commitment to improving bike infrastructure, facilities and programs "at the pace and scale so desperately needed".

In 2012, Senator Ludlam launched a "bike blackspot" smartphone application that allowed cyclists to send photographs and descriptions of unsafe conditions to a website and to the Transport Minister.

View photos This bike path at the Cottesloe train station ends suddenly. More

This bike path at the Cottesloe train station ends suddenly.

More than 400 sites have been identified as being dangerous to cyclists, including paths that end abruptly, are cracked or covered with vegetation.

"Yet sadly, it seems these reports and the significant problems on our bike network are falling on deaf ears, putting lives and the dignity of our bike-riding (and bike-shy) citizens at risk," the submission said.

"In the past 12 months, both ridership and serious accidents have continued to rise in Perth.

"According to the Bicycle Transport Alliance, there have been 16 serious bike accidents on WA roads, including 10 fatalities since February 2014."

View photos The Causeway is Perth’s number one bike blackspot because it is so narrow. More

The Causeway is Perth’s number one bike blackspot because it is so narrow.

The submission said since March last year, five WA cyclists had used the app to report dangerous accidents they had been involved in.

One report was from a rider who in March this year clipped a bollard in the middle of the Fremantle to Coogee Marina path, and ended up with fractured fingers and a cracked rib.

The worst blackspot was identified as the Causeway, largely because it is so narrow.

"This bike path was horrendous this morning … lots of bikes, walkers, dogs, prams, joggers - it is incapable of handling this traffic safely," one rider wrote.

View photos A wona was injured when she cycled into this near-invisible bollard on the Fremantle to Coogee coastal bike track. More

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