hello.<br/><br/>I am very confused when talking about crossing roads.<br/><br/>"<b>Cross the road on / at</b> the crosswalk."<br/><br/>"<b>Cross the road on / at</b> the pedestrian overpass."<br/><br/>these are what I have come up with, but I'm not sure if I'm correct.<br/><br/>does it sound ok to say like these?<br/><br/>thanks in advance.