I legitimately cannot think of any games with decent traffic modeling.
Honestly? If your worried about traffic, subscribe to Iracing and play with the spec miatas that they give you when you sign up, and then do live racing on a single screen. You will gain spacial awareness extremely quick and having the FOV hampered will make you check your surroundings often and simulate having blind spots, making you use your mirrors. Especially since spec miata on IRacing take off from a dead stop, the first few laps are always hectic and stressful. If you can figure it out on there, you can do it in real life with much less stressful environments.
Also the clutch and shifting feels pretty great on the spec miata. Also if you suck at racing you will get paired with other people who suck and are more likely to spin out, which is a lesson in wreck avoidance I guess