Roads for towns

It would be cool to be able to connect parts of towns with other ones using small roads. Not full sized districts.
I could see this being useful in following scenarios:
1: Putting services on the side of the roads so they don't interfere with future districts
2: Making a railroad go through the city
3: Connecting 2 town districts on different elevations
There could be a road limit to prevent making one giant megacity too

It is about planning, but you can preplan your services - they connect to city even when connected to a ghost/puased district. So just place some district ghost and go from that. You may really not end ep with that big cities anyway, as Housing IV has capacity of 400.
Although it could be nice to somehow connect districts on different elevations, this is not that needed and could be problematic.