Occasionally AIs can stall their engines or overcook their clutches. In which case the AI would only shift gears or rev the engine without going anywhere. Since the car isn't rolled over the AI won't try to reset even if it's allowed to.

Please consider giving the AIs the ability to use the starter or detect clutch overheating and enter a cool-down mode. Resetting can also be used as an universal fallback. If the car has not been moving over a specific amount of time for any reason, just try to reset.

While I believe using the starter shouldn't be difficult to add, clutch is probably more of an issue, as we need to consider why the AI cooked it in the first place; in my experience, this mainly happens if they get stuck for some time, e.g. after a crash or spin, and they struggle to move again (or try to go forward, then reverse, multiple times, especially with some cars).

I think there's a bigger underlying problem here: AI is at its best when it's driving along its line, and is not really good at doing anything off line (at least now it's able to go 2-wide into corners), and also does very little to avoid obstacles on its path at low speeds (if you don't move from the front of the grid at race start, chances are you will have a train of AI cars "stuck" behind you). Its starting behavior is also quite clearly flawed as it is likely based on a timer of some sort to determine when to abort driving away and try to reverse instead, thereby putting stress on the clutch.

Also, I believe Scawen said he wouldn't really touch the AI code again until the new tyre physics are done, which makes sense when trying to get them to drive close to the limit, but not as much sense from a purely behavioral perspective; ultimately, we don't know how AI decision making and navigational behavior is done, we can only guess some parts (such as the racing line likely being followed by a PID controller, with a separate line for the pitlane, given the sometimes rough transition between the 2).

Quote from Bokujishin :

While I believe using the starter shouldn't be difficult to add, clutch is...

I actually don't mind the AIs performing poorly off the ideal line. They are not going to provide any exciting wheel-to-wheel racing anyway. All I want is some vehicles looping around the track without relying on other human players from a remote server.

The issue is, when AI cars get stuck, they can stay on the racing line or very close to it, which means the track has unwanted obstacles. One vehicle being stationery on the line can also lead to a chain reaction, and AI cars will pile up, even blocking the entire track in some cases.

I would rather have the AIs teleporting back to pits then come out again if they can't become unstuck any other way.

Here's a massive pile of madness started from one vehicle being stuck: