Pedestrian signal indications should be used at traffic signals wherever
    	warranted, according to the MUTCD. The use of WALK/DON’T WALK pedestrian
    	signal indications at signal locations are important in many cases, including
    	when vehicle signals are not visible to pedestrians, when signal timing
    	is complex (e.g., there is a dedicated left-turn signal for motorists),
    	at established school zone crossings, when an exclusive pedestrian interval
    	is provided, and for wide streets where pedestrian clearance information
    	is considered helpful.1
 
    The international pedestrian symbol signal is preferable and is recommended
    	in the MUTCD. Existing WALK and DON’T WALK messages may remain for the rest of their useful life but should not be used for new installations.1
    	Pedestrian signals should be clearly visible to the pedestrian at all times
    	when in the crosswalk or waiting on the far side of the street. Larger pedestrian
    	signals can be beneficial in some circumstances (e.g., where the streets
    	are wide). Signals may be supplemented with audible or other messages to
    	make crossing information accessible for all pedestrians, including those
    	with vision impairments. The decision to install audible pedestrian signals
    	should consider the noise impact on the surrounding area. Much more extensive
    	information on the use of accessible pedestrian signals (APS) and the types
    	of APS technologies now available is provided online at www.walkinginfo.org/aps.