Welcome to 20's Plenty for Otford Our aim is for Otford to have a 20mph default speed limit where people live, without traffic calming. Let's change the way we share our roads. Make Otford a safer, happier and healthier community for everyone. 20mph in residential roads can make a difference. Why? - 95% reduction in risk to walkers and cyclists. - less pollution, less noise, less fear and a better quality of life. We are a local group of 20's Plenty for Us, the national voluntary organisation that supports communities who want lower speed limits on their streets.