If you plan to buy a Tesla for your job, you won’t be able to use the company’s Supercharger stations anymore. The company recently released a new policy called Supercharger Fair Use, which prohibits new commercial drivers from using the red-and-white charging ports.

Tesla has been working to expand its network of charging stations, announcing in April that it hoped to have more than 10,000 Supercharger stations by the end of 2017. The expansion is needed to alleviate heavy traffic at the stations, which have become a congestion point for drivers. Last year, the company announced fees for charging, and said that it will begin charging drivers an additional fee if they leave their cars at the stations after they’ve finished charging.

Tesla says that the stations are intended for drivers who don’t have ready options for charging at home or at work, and that when they’re not used for this purpose, “it negatively impacts the availability of Supercharging services for others.” Thus, the new policy says that for vehicles purchased after December 15th, drivers who plan to use their vehicles as a taxi, for ridesharing, commercial delivery or transportation, governmental purposes, or other commercial ventures won’t be permitted to use the free stations.

The company tracks usage and driver behavior, and if they find that someone isn’t complying with the policy, they might be asked to stop, and simply limit or block one’s vehicle from the stations in certain instances. The policy went into effect on Friday, December 15th, 2017.

A Tesla spokesperson said that the company does “encourage the use of Teslas for commercial purposes,” and that they will work with drivers to find other places to charge their vehicles. The policy carve out an exception, saying that some stations might be excluded, depending on local circumstances.

Update December 17th, 2017, 2:30PM: A Tesla spokesperson clarified that the policy applies to new Tesla drivers as of December 15th, 2017.