Roundabout drifting

[Josh]

The rule used to be servers specific to just Montana (when the roundabout was introduced).

The main reason it is disallowed is that it causes problems such as congestion - theoretically people should wait until the roundabout is clear before they join, if someone is drifting it, then technically nobody can join. This is especially a problem with cars coming from Highway 1, towards a queue of traffic at the roundabout.
Also, if someone is constantly driving around it, people driving down Lower Hillside to Main Street (or the other way round) and don't stop, you have a big problem.. In short, it causes necessaries congestion and crashes.

As other layout developed with similar roundabout the rule was enforced across all servers.

Drifting a roundabout can still be enforced under rule 1.2 (This includes negligent and reckless driving, provoking accidents, for example blocking the track, doing stunts or doughnuts on the road and so on).

I'm not sure when the server specific rule was removed.