City authorities are to increase protection for 27 km of Romes bus, tram and taxi lanes by spring 2007. The selected priority traffic lanes will be delineated using a raised plastic strip in order to deter other motorists from abusing them. Environmental agency Legambiente estimates that three car drivers invade the lanes every minute in some of Romes streets. Authorities say the project will increase the average speed of public transport in the relevant areas of the city by 10-18 minutes. Work will begin in September between Largo del Tritone and Piazza Barberini and between Piazza S. Andrea delle Valle and the Lungotevere as well as on Via Nazionale, where it is hoped that protected lanes will help to alleviate noise pollution and vibrations. Rome currently has a total of 98 km of priority traffic lanes.