00315nam a2200109Ia 4500008004100000082001400041082000800055245009300063245002000156260002000176300000900196231017s9999    xx            000 0 und d  a388.41312  bHAR 0aNCHRP Web-Only Document 117B: Guidelines for Accessible Pedestrian Signals: Final Report 0cDavid L. Harkey  bDavid L. Harkey  c30cm