The FIA has dropped the rule that restricted how many times a Formula 1 driver could change their helmet livery during the season.
The rule was originally introduced to help the spectators identify drivers more easily.
However, it was unpopular with many competitors who liked to change their designs on a regular basis, such as Daniel Ricciardo and Sebastian Vettel.
The rule stated: "In order for drivers to be easily distinguished from one another whilst they are on the track, the crash helmet of each driver must, with the exception of one event of the driver's choice, be presented in substantially the same livery at every event during a championship season.
"A change to helmet livery will also be permitted if a driver changes team during a championship season."
However, the teams agreed to drop the rule, and that decision was officially approved today by the WMSC, who noted that "unrestricted variations to driver helmet designs between races" will henceforth be allowed.
The WMSC also formally confirmed the 2020 minimum car weight increase from 745kg to 746kg, and clarified that the post-season test in Abu Dhabi will be used to assess Pirelli's 2021 18-inch tyres.
A series of changes were also approved for the 2021 technical regulations, which have undergone extra scrutiny since they were published in October.
They include some designed purely to give the teams extra bodywork space for sponsorship logos, as well as stricter impact tests that have been influenced in part by last year's Spa F2 accident:
- Changes to the front wing profiles to prevent downwash which would have resulted in a severe compromise to the overall objectives to allow cars to race more closely
- Front wing endplates, top bodywork and rear wing endplates have been modified to give the teams more commercial space
- Drastic improvements to the strength and energy absorption of the chassis in front, lateral and rear impacts
- A number of updates to considerably improve electrical (high voltage) safety on the cars
- Tethers will be mandated for rear wing and rear impact structures
The WSMC also confirmed that US company Kulite Semiconductor Products has been appointed as the official supplier for power unit pressure and temperature sensors for 2021-23.
In a change to the new 2021 financial regulations, it now allows "monitoring activities to be performed by Cost Cap Administrators at any point in time, remotely or at F1 teams' premises."