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Yes this is a noob question but I know how to upgrade roads, however I've built all of my roads as double lane roads with residences at the sides. If I upgrade these roads to a six lane road for example, I'll lose all of my level 2 residences. Is there anyway to fix traffic without destroying loads of shops and houses?
Traffic is one of the things that takes time to master. I would suggest you visit the Steam workshop guides section and search for traffic, there are some good guides that explain the basics. http://steamcommunity.com/app/255710/guides/?searchText=traffic
As far as upgrading to a wider road, there is no way to do this without dismantling the growables that are along said road.
You just have to do it and then re-color the area again for new growables to emerge.
Also, if I feel that a particular 2-lane road might be a candidate for upgrading in the future, then I make sure that if a parallel road is built along side it, that the road has the equivalent of at least one cell as a buffer between the two roads.
PS: If you think that two, 2-lane roads that are parallel to one another, might both be upgraded in the future, then have a buffer in between the two roads that is at least 2 cells in size.
Like 28rommel said, leave space at the start so the road widening will still leave you with 4 cells deep for zoning. I do this all the time now. Works great.
You still knock the buildings down, but usually by that point they will grow back fairly quickly.