arrow danger dangerous directing direction directions door doors doorway emergency emergency exit escape exit exiting fire green guide help icon indoor instruction leaving life man path protection run running save sign signs symbol urgency wall warning acceptable advice advising allocated allocation appropriate-behavior appropriate-behaviour approved communicating communication directional indication indicator information informing letter lettering off-road parking parking-bay public pullover roadside white word wording blue left right road sign straight access accessibility be-careful black care careful caution conditions disability disabled handicapped Look looking lookout safety symbols wheelchair bicycle bike cycle ride roadsign aid assistance deaf deafness hearing-impaired hearing-loop helpful impaired informative loop arrows bicycles metal metallic opposite pavement pictogram red route silver two bark bicycle trail biking cycle trail forest mark natural paint road trail tree trees wood woods airport words