By (Hannah Brown, Local Democracy Reporter) Having a default 20mph speed limit on new residential roads in Cambridgeshire will help save lives, councillors have said. Proposals to reduce the speed of cars on newly adopted residential roads was backed by a majority of councillors at a Cambridgeshire County Council full council meeting today (Tuesday, October 18). The default speed limit for residential roads adopted by the authority – meaning the roads it takes responsibility for maintaining – had been 30mph. A motion presented by Cllr Philippa Slatter (Lib Dem, Trumpington) called for the coun…