People should stay away from the special vehicles used to ferry people to and from the Winter Olympic venues in the event of a traffic incident, Beijing's traffic management authority warned on Sunday.
Personnel involved in the Winter Olympics will be kept in a "closed loop" operation and should avoid contact with people outside it, the Beijing Traffic Management Bureau said in a post on its Twitter-like Weibo account.
If there is an accident with one of the vehicles, people should maintain a safe distance, avoid contact with those inside and wait for professionals to arrive at the scene, the post said.
Authorities closed the bubble last week, meaning that thousands of staff, volunteers, cleaners, cooks and coach drivers will be cocooned for weeks with no access to the outside world.
The global media and about 3,000 athletes are expected to start arriving in the Chinese capital in the weeks ahead and are to remain in the bubble from the moment they land until they leave the country.
Anyone entering the bubble must be fully vaccinated or face a 21-day quarantine when they arrive, and everyone inside is to be tested daily, with mask-wearing being mandatory at all times.
The system includes dedicated transport between venues, with even closed-loop high-speed rail systems operating in parallel to those open to the public.