I built ResidentialShoppington because there was no way for me to keep enough residents living in the city without (A) clogging up my streets and preventing my delivery trucks from making it to import/export before I ran out of money, and (B) keeping my tax rate high enough to survive the time between export deliveries. I'm still inviting more people, but if we get full and someone wants to take over that city from me, let me know and I'll abandon it for you.
Some suggestions for the region: maintain wind farms since I'm pumping out a whole oil plant. Also, pollute one side of your city and pump water from the other. When your clean water shelf runs out, clear some space and pump filtered water over the polluted space. Make sure to delete the standard pump that comes with the building and replace it with a filter one. If you have a trade HQ, don't buy the petroleum upgrade. I'm working on getting my PetroHQ up, so that will cover the region. For City Hall, I already have a Dept. of Education, Dept. of Safety, and Dept. of Utilities. We need a Dept. of Finance and the other one.
Have the streetcars proved useful at all? I'm using a traffic design that worked in SC4 (and let's be honest, traffic was damn near impossible in SC4) but I'm still having trouble managing it. I recently added buses (which don't seem to be doing anything yet) and am planning a loop of streetcars around an area which will eventually be very dense. But I'm thinking I'll have to redo my roads inside the loop so I can upgrade to streetcars later.
I'm in the process of re-doing my city as I exploit more resources, and my taxes are jacked up so high that everyone moved out. I'm shifting to a commuter industry city. Once I unlock the petroleum bays on the trading port, I can shift back to having more population, and maybe even some gambling since I have a cracking police force. (Get it? Cracking?) That'll keep my delivery trucks on the industrial periphery and they won't have to cross the city.
Anyway, my streetcars are turned off most of the time. I only turn on street cars and my bus terminal when my population booms are having enough in the bank to lower taxes. Once the traffic gets clogged, I send out public transport and it doesn't work all that well. Trains seem to work MUCH better, and they're cheaper to maintain as well. Someone on reddit has a population of hundreds of thousands with zero traffic, and it's because they have rail running in an S pattern across the grid in between all of their avenues. And it's funny because when you add streetcars, some of your industrial business owners and workers will get thought bubbles complaining about the city adding prissy street cars. "HEAVY rail is what we need! YEAH ****IN HEAVY!" (emphasis mine)
Quick question: does anyone have market data on all the other trading goods? Fuel trades at 21k per lot, and plastic is 5k/lot.