I noticed something interesting. Don't know if it is intentional or if you just haven't gotten to it yet.
The cars all go in the same direction, with what looks like the cars on one side of the road going backwards.
One aspect of the animation, when the game is in pause mode, it would be visually appealing if the cars and people would freeze in place.
Not a requirement, but would be nice. I think keeping them at the same animation speed on all of the un-paused speeds is the right choice though.
Otherwise, it looks really nice. I let you know if anything else pops out at me later.