Super obvious response, but it depends on the city. Smaller denser European cities that were not designed, but evolved over hundreds of years from earlier settlements, don't handle car traffic very well and are better suited to walking and cycling (or battery operated scooters). But even larger cities over here work well for walking and cycling because you tend to find lots of bars, restaurants, convenience stores and shopping malls all over them. In my home town, you can't walk a mile without passing a dozen bars, a dozen restaurants and two decent grocery stores.
But it's not just down to city size. Take a city like Provo in Utah. It's not large by any standard, but it's completely designed for cars. It has awful public transport, a grid 'motorway' system cris-crossing it, everything-as-a-drive-thru, lots of unused space, lots of parking lots... If you try walking around it, you'll just spend hours walking past nothing in particular to get to nowhere special.
It seems that everything is way too far apart because it's all separated by huge sprawling parking lots that are mostly empty. 50-70% of the acreage is devoted to cars not even counting the ultra-wide roads and only occasional pedestrian crossings every half mile. These roads usually have speed limits well above 45 mph. The worst examples I can think of are Scottsdale AZ and Irvine CA.
It isn't surprising that so many cars are on the road when just to cross the street you need to walk a quarter mile on average. Then you have to cross the death trap parking lots with zero shade and 120 degree black top.
But it's not just down to city size. Take a city like Provo in Utah. It's not large by any standard, but it's completely designed for cars. It has awful public transport, a grid 'motorway' system cris-crossing it, everything-as-a-drive-thru, lots of unused space, lots of parking lots... If you try walking around it, you'll just spend hours walking past nothing in particular to get to nowhere special.