access armed authorities authority availability available badges barriers cars communicating communication control deployment equipment flashing-lights law law-&-order lights motor-bikes National-Day on-duty on-the-job order patrols police police-vehicles power presence regulations responsible security Singapore symbols traffic traffic-control uniforms vehicles weapons advice alert allowed announcement appropriate-behavior appropriate-behaviour black canine care careful clean-up consideration controlled denial denied directions dog dogs exception guidelines information informing lead leash pedestrians permission-granted pets purple risk risks rules safety sign signs track walk walkers walking welcome white cables connect domestic home houses junction phone pole tangle telephone wires wooden blue clear copyspace radiate sky talk talking tree be-careful beware caution concern crossing danger dangerous listen Look looking lookout observant rails railway railway-crossing red road trains warning warning-sign watch watch-out accessibility allocated allocation approved arrow conditional conditions directing direction directional disability disabled fee-free free handicapped indication indicator no-fee parking symbol wheelchair word acceptable advising all-week carpark fee fees limited machine money no-freebies paid park payment permitted public restrictions ticket ticket-machine ticket-parking ticketed timed