Hardly anyone will notice, since they only have 12~14 cars per 100 people in Singapore (different sources give slightly different numbers) and they have a world-class public transit system which makes car ownership more of a hassle than it's worth.
Here in Taipei it's similar, but less so... Overall car ownership in Taiwan is about twice that of Singapore, but that includes a ton of rural area, which Singapore lacks. In a big city with excellent public transit, there's really no need for a car. Hell, I even gave away my scooter a few years ago.
I'd say the bulk of the traffic in Taipei is: a) local "fleet" vehicles like taxis, buses, delivery vans; b) commuters to and from the surrounding 'burbs; c) scooters, motorcycles, bicycles, etc.. Commuters in the 'burbs tend to have a designated parking space at their apartment block, and another designated space at their employer in the city. Commuters who live in the city are far less likely to have a designated parking spot at home*, so they may spend half an hour looking for one when they get home from work. Major PITA.
OTOH, with public transit you can get all the way across town in under 45 minutes for $1~2 USD, or you can cut that time in half (depending on traffic) by taking a taxi for about $8~12 USD.
I do enjoy driving -- growing up in Iowa, I drove all the time, from age 14 -- but living in a city like Taipei, I'm quite happy NOT owning a car, or any motor vehicle, for that matter.
* Due to land availability, a higher percentage of residential housing in Taipei is "old construction" from the days when common folk didn't own cars. Newer construction (say, the last 30 years) tends to always include parking, but there's been more new construction in the open lands outside the city, and since the rent tends to be cheaper, a lot of people live there.