

I don’t know how it is in never-colonized countries, but here, local bodies don’t get much by way of taxes and infrastructure spending is by state or national government since all income and business taxes go to them ala colonial administration. Locals don’t have leverage over infrastructure projects, and local body politicians have no pressure from locals over their handling of non-infrastructure funds.
The biggest motivator for cars and wide roads are weekend getaways; there are good options for commute and long-distance travel. Maybe, if you ban private car purchases and have good rail connectivity, people’d get by on rentals.