The dosage makes it either a poison or a remedy.

2003 Parc Ferme

Before parc ferme, teams could use a different car for qualifying than for the race, so they could set them up entirely differently

2004 Single engine per weekend

New requirement to use the same engine all weekend, instead of a fresh one for the race after qualifying. This also limited the use of a spare car since it would have a different engine.

2006 Limits on number of tires allowed

14 sets of tires per weekend

2010 No refueling

The time of pit stops dropped dramatically as cars no longer needed to refuel. Additionally, this meant cars started heavier at the beginning of the race and got lighter, meaning that drivers needed to manage the handling of the car as low fuel cars move more nimbly. Failing to adjust might mean that a fine move in lap 7 sends the car into the barrier on lap 50. . Heavier weight also put more strain on the tires in the first laps.

2011 Pirelli tires for all

Without refueling, strategy became more static. The goal of Pirelli was to create tires that degraded fast to force pit stops and so overtaking opportunities. Tires have the biggest impact on car performance, even above engine, so having everyone on the same ones also forces the drivers to adapt to those tires

2011 Ban on Team Orders Rescinded

Between 2002-2010 it was forbidden to instruct a driver to move over for a teammate.

2014 Hybrid V6 engine introduced

All drivers must now manage battery in addition to tires, including recharging and clipping

2026 Synthetic and bio fuels introduced