bicycle bike bikes biking cycling fender vintage wheel bicycles bush HDR lawn Nyberg park summer two animals prohibited appropriate behavior appropriate behaviour bicycles prohibited black black and white communicating communication denial denied dog informing littering prohibited no animals no bicycles no littering not allowed not permitted permission denied prohibited prohibition prohibitions rules sign warning white cycle grass long path perspective tarmac pedal red transport wheels building car cars houses London street extreme jump mountain bike sports sunrise sunset bicyclist diverge green paths pedestrian trees Dustbin faulty pavement autumn fog weather