Since the deaths of Senna and Ratzenberger, the FIA has used safety as a reason to impose rule changes that otherwise, under the Concorde Agreement, would have had to be agreed upon by all the teams – most notably the changes introduced for . This so-called 'narrow track' era resulted in cars with smaller rear tyres, a narrower track overall, and the introduction of grooved tyres to reduce mechanical grip. There were to be four grooves on the front (three in the first year) and rear that ran through the entire circumference of the tyre. The objective was to reduce cornering speeds and to produce racing similar to rainy conditions by enforcing a smaller contact patch between tyre and track. This, according to the FIA, was to reduce cornering speeds in the interest of safety.