Even if we had low-emissions, low-noise-less, low-accident cars, there’d still be the concrete jungle surface needed to drive them - and loads of emissions to make the steel and cement of highways.
Although cars carrying four or more people directly to a medium-distance destination can be relatively efficient per pers-km, people buy oversized cars imagining some dream holiday, then use them for daily life on one-person trips that (electric-) bicycles and/or trains could do - car-sharing can help avoid that (although personally, my dream holidays would be in places with no cars at all).