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While ADAAG covers various features common to public streets and sidewalks , such as curb ramps and crosswalks , further guidance is necessary to address conditions unique to public rights-of-way . For example , a dentist seeking certain services may be viewed as posing a direct threat if she / he has a highly communicable disease such as active TB , as opposed to HIV , which can only be transmitted via blood or certain other body fluids . And do you have any target dates for when GNEP would be a viable program for implementation or is it something that could be done in stages with other countries with the technologies such as - ( inaudible ) - or reprocessing or what not to begin implementing right away . However , do not attempt to compare such readings to the UL 0.5 coefficient of friction standard or to a manufacturer 's slip resistance values unless the same testing methodology , machine , and sensor material was used in each instance .