alert appropriate-behavior appropriate-behaviour approval approved black care communication concern danger dangerous denied directions green inform information informing not-allowed not-permitted park permission-denied permitted prohibited prohibition prohibitions protect protection public-park red rules safety sign signs vehicle warning warning-sign white armor armour army blackboard Centurion helmet isolated legion roman rome soldier countryside direction Downs England grass marker point post south Sussex way advice announcement be-careful beware careful caution communicating go light lights listen Look looking lookout observant pedestrian pedestrians risk risks trams watch watch-out authorisation authorised authorization avoid flammable gas gaseous no-ignition outlet potential risky stay-clear vapour vapours warned communicate disapproval disapproved multiple-prohibitions restricted restrictions forbidden parking roadsign roadsigns standing stopping ban banned double dual illegal prohibit twice veto weird agrimotor bicycle circle horse road street tractor triple wheel ahead arrow icy icy road river wave waves blue cloud message science sky student