Speed camera statistics have been published online in a move which allows people to look at their performance.
Links to some or all information on accidents and casualties at speed camera sites from 75 councils have been published on the Department for Transport (DfT) website so far.
Data from other local authorities - which will also reveal how speeds have changed at sites since cameras were introduced - are expected to follow soon.
People will be able to use the information to make up their minds on whether they think speed cameras are an effective tool for reducing accidents and encouraging people to driver more slowly in their city, town or village.
Police forces are also going to publish how many prosecutions are brought each year for incidents related to speed camera sites - along with information on the number of drivers receiving penalty points on their driving licence or being take to court.
Road safety minister Mike Penning said: "I hope that this information will help local people to make informed judgments about the impact cameras are having on their local roads."