With Labour, Liberal Democrat and Green assembly members already pledging their support, the motion looks set to be passed, while LCC says it is waiting to hear from the Conservatives about how their representatives will vote.
The motion has been tabled following concerns raised by LCC, as well as an email campaign publicised by that organisation as well as bloggers such as Cyclists in the City and iBikeLondon, and reads:
"This Assembly regrets the Mayor's failure to retain the temporary 20mph speed limit on Blackfriars Bridge in the permanent new scheme for the bridge.
“We note the recommendation for a 20 mph speed limit on four London bridges in a 2008 Transport for London report, and the recent decision of the Corporation of London to ask officers to bring forward plans for the whole of the City of London to become a 20mph zone, including TfL roads.
“We ask the Mayor to reconsider his rejection of a 20mph limit on Blackfriars Bridge, in the interests of the safety of all its users."
Even if the motion is passed, there is no formal requirement for Mr Johnson to overturn his decision, although clearly it would put pressure on him to do so, and LCC is urging cyclists to sign a petition giving their backing to retaining the 20mph limit, which was put in place as a result of roadworks being carried out on the bridge.
Protests against the decision to remove the sped limit included a ‘flashride’ last month in which hundreds of cyclists took part.
You can sign the LCC’s petition here.
Born in Scotland, Simon moved to London aged seven and now lives in the Oxfordshire Cotswolds with his miniature schnauzer, Elodie. He fell in love with cycling one Saturday morning in 1994 while living in Italy when Milan-San Remo went past his front door. A daily cycle commuter in London back before riding to work started to boom, he's been news editor at road.cc since 2009. Handily for work, he speaks French and Italian. He doesn't get to ride his Colnago as often as he'd like, and freely admits he's much more adept at cooking than fettling with bikes.