Well seeing as I haven't played this world yet, if you think 2 squares are better I can easily move the lots up a bit, sicne I've only put down lots and roads for that very reason.
So I should probably leave about two squares around the road to :#
https://i.imgur.com/HUEL0Z9.jpg
See they are one square apart, this is the city center but moving them up so there is two square difference will be worth it if it means horses won't get stuck.
https://i.imgur.com/cUnCTY4.jpg
Lastly, the red showing through the grass, sims won't be able to walk there?
https://i.imgur.com/4dUy50G.jpg
Thanks again for answering all my question XD The last world I attempted I didn't bother much with any of this.