– west ▁streets ▁and ▁north – s outh ▁a ven ues . ▁Broadway ' s ▁inter sections ▁with ▁a ven ues , ▁marked ▁by ▁" squ ares " ▁( some ▁merely ▁tri angular ▁sli vers ▁of ▁open ▁space ), ▁have ▁induced ▁some ▁interesting ▁architecture , ▁such ▁as ▁the ▁Fl at ir on ▁Building . ▁ ▁At ▁Union ▁Square , ▁Broadway ▁cross es ▁ 1 4 th ▁Street , ▁mer ges ▁with ▁Four th ▁Avenue , ▁and ▁continues ▁its ▁diagonal ▁u pt own ▁course ▁from ▁the ▁Square ' s ▁north west ▁corner ; ▁Union ▁Square ▁is ▁the ▁only ▁location ▁where in ▁the ▁physical ▁section ▁of ▁Broadway ▁is ▁dis continu ous ▁in ▁Manh attan ▁( other ▁port ions ▁of ▁Broadway ▁in ▁Manh attan ▁are ▁ped est rian - only ▁pla zas ). ▁At ▁Mad ison ▁Square , ▁the ▁location ▁of ▁the ▁Fl at ir on ▁Building , ▁Broadway ▁cross es ▁Fif th ▁Avenue ▁at ▁ 2 3 rd ▁Street , ▁and ▁is ▁dis continu ous ▁to ▁vehicles ▁for ▁a ▁one - block ▁stretch ▁between ▁ 2 4 th ▁and ▁ 2 5 th ▁Stre ets . ▁At ▁Gree ley ▁Square ▁( West ▁ 3 3 rd ▁Street ), ▁Broadway ▁cross es ▁Six th ▁Avenue ▁( A venue ▁of ▁the ▁Amer icas ), ▁and ▁is ▁dis continu ous ▁to ▁vehicles . ▁M acy ' s ▁Her ald ▁Square ▁department ▁store , ▁one ▁block ▁north ▁of ▁the ▁veh icular ▁dis continu ity , ▁is ▁located ▁on ▁the ▁north west ▁corner ▁of ▁Broadway ▁and ▁West ▁ 3 4