Blimey! Ask the answer to the life and universe. A Bus Lane can be marked retricted at all times, or at the times displayed at the start of the lane, to the vehicles on the sign, Taxis (By which at least TFL mean Hackney Carragies licensed by cab office not mini cabls.Addison Lee just had a very expensive court case over this) Bus or bicycyles. The motorcycle bit was an 'Experiment', then apparently THEY needed more information of acidents caused by vehicles turning right!(Sorry meant LEFT, original very early after long night work) Then you have Guided bus lanes, which is trams on the cheap. In that case the lane is edged by kerbs and the bus has two guide wheels on the side which engage and guide it. In that case the bus also has to be registered as a Locomotive! The down side is , swing into a standard stop catch the kerb and boomerang out into traffic. Then you have Contraflow bus lanes, ......... Coaches are not permitted to use bus lanes, though David Ives will clarify. Basically if the vehicle is not a Stage Fare bus serving the local authority, it 'aint a bus. The God's in this are the Transport Commisioners who licence the firms. PS, Don't balls about with D1 do the full D test, it is the same test as D1 and you get to drive any number of seats, regardless of vehicle weight! The theory tets for D and C are diffrent though, as for the Hazaed Awarness test , as the Examiner said to me 'Drive like a tit and you'll pass it. However if you got into the situation where you had to brake or swerve, I'd rip you another ***** you should have seen it coming a long time before'. https://www.gov.uk/government/publications/traffic-commissioners