Should governments spend more money on improving roads and highways, or should governments spend more money on improving public transportation (buses, trains, subways)?

If someone goes on a hill or a high place and has a look at what is going on, down on the vast area, he will see a lot of curved lines that are like snakes, creeping in each other and there are some tiny objects that are moving like thousands of insects. Living in modern cities needs more traveling during the day because people go to different work places. This is a good reason …

…body thinks why all these should happen. If we encourage people to take public transportation, they would be safer and the amount of psychological and economical effect on the society would decrease. As a result, I think government should spend and even invest more money on public transportation to prevent more pollution in cities and let people live in healthy condition. Also by improving public transportation we avoid more accidents and consequently decrease death toll.