<P> TRL produced a further report in 2003' Monitoring of the M4 bus lane: 2000 to 2002' . </P> <P> A 2005 literature review of research into high - occupancy lanes produced for the Highways Agency reported that the lane was used about 3700 vehicles a day (3100 taxis, 500 buses or coaches and 100 minibuses) and that there was an overall benefit was 200 person - hours per weekday and a dis - benefit of 350 person - hours per weekend day; the dis - benefit being the result of the reduced speed - limit . </P> <P> A number of freedom of information requests have been made in relation to the M4 bus lane: </P> <Ul> <Li> 14 August 2009--Highways Agency which revealed that a total of 20 Penalty Charge Notices had been issued since January 2008 for misuse of the bus lane . </Li> <Li> 29 October 2009--Public Carriage Office which revealed that 192 complaints had been made about private hire vehicles using the bus lane . </Li> <Li> 2 October 2010--Seven FOI requests were received by agencies following the announcement that the lane was to be removed: <Ul> <Li> Highways Agency (two requests), the first requested details of data held relating to the operation of the bus lane, in particular reports produced by the Transport Research Laboratory and around the decision to remove the lane . The Response was delayed with the reason given as "The complexity and volume of the requested information and the current position surrounding the issues of the M4 bus lane mean that it is impracticable for us to give a full response within the original 20 days". The second requested details of the changes, communications relating to the changes and analysis . </Li> <Li> Department for Transport requesting details of data held and correspondence relating to the bus lane . No response had been received by 13 November 2010 . </Li> <Li> Transport for London who responded saying that they had not been part of any discussion . </Li> <Li> Borough Councils traversed by the bus lane Hillingdon Borough Council, Ealing Borough Council, and Hounslow Borough Council responded saying that they had not been part of any discussion . </Li> </Ul> </Li> <Li> 13 October 2010--Prime Minister's Office requesting details of correspondence regarding the removal of the M4 Bus Lane . The response was that no information was held by that office . </Li> </Ul>

Why is there a red lane on the m4