Both. 1980s Era civil/traffic engineers in NA were all trained for car=future=build road. Nowadays most traffic engineering/city planning schools teach multimodal transportation as The Way, but decades of car washing our cities has resulted in an almost total collapse of public support for anything except another lane. Luckily, most people sub-30 are aware of this and are slowly becoming politically active. Public opinion will shift slowly over the next decade or two and eventually the traffic engineers will be allowed to do the right thing.