There are important changes to the Formula 1 rules and regulations in 2007.
Tyres: In 2007 the Formula 1 teams will use just one tyre supplier: Bridgestone. This means that tyre development has slowed down as the battle with Michelin is over and there is in effect a control tyre. There will however be two kinds of dry tyres at each event and these will be distinguishable with white markings on the sidewall of the tyres. The drivers MUST use both of the two compounds in the course of a race, unless there is rain and they use either wet or extreme weather tyres. This means that the handling of the cars will be different at different points during the race which should spice up the action and keep Bridgestone in the spotlight.
Engines: The 2.4-litre V8 engines have all been "frozen" which means that their engines are now much less significant than in previous years with most of the teams having more or less the same levels of horsepower.
Testing: The Formula 1 teams agreed to the voluntary introduction of a testing agreement that limits each team to an annual limit of 30,000 km. Friday's activity is now, in effect, a test day with the teams being allowed to run a third driver. The two Friday practice sessions have expanded from 60 minutes to 90 minutes and teams may use two cars, which may be driven by either the two race drivers or a nominated third driver. The penalty for an engine change no longer applies on Fridays.
Safety Car: There are significant changes to the use of the Safety Car with cars no longer being allowed to go into the pits until they are all formed up behind the Safety Car and a signal is given. Lapped cars will be able to pass the Safety Car so that the lead cars end up in the correct order when the race is restarted.
Car identification: The teams are now mandated to run a yellow coloured roll bar on the number one car and a red roll bar on the number two car. This is to help the identification process.