The rivals for the title are still free to race, but Mercedes says they have established greater deterrents for contacts between their cars.
According to boss Toto Wolff, drivers will face financial and sporting consequences. Wolff, who refused to share details about the possible sanctions, gave hints that race suspensions may be included.
This move comes after a recent collision during the last lap in Austria, as Hamilton tried to pass Rosberg and gain the lead. Over the course of five races, that was the third occasion of contact between them.
Hamilton, a triple world champion, ended up winning the race, and Rosberg, leader of this season’s title race, fell back into fourth with damage to his car.