For certain trips like residential cluster A to residential cluster B. Add in a realistic scenario like commuting to work from your residential tower to a warehouse job in a low density light industrial zone and cars will be faster every time. I live in a place with supposedly world class public transportation and it still makes very little sense to take public transportation outside a few scenarios. Most realistic trips you're looking at 2-3 times the travel time you would have by car, even during rush hour.