Proper roundabouts work reasonably well with pedestrians in most places but in PGH, the attitude towards pedestrians of most people who drive is utterly atrocious. On top of that I have never seen any enforcement by police for failure to yield to pedestrians even when it happens right in front of them (and similarly I see police fail to yield to pedestrians as well). So I don't think the pedestrian experience is going to be good at a roundabout in PGH but I don't think it's going to be any worse than it is anywhere else in the city.