Lets say they get 3 sets of soft tires a weekend . They use one set for qualifying if they want , its an option . NASCAR mandates you have to start the race on soft tires . It will probably help rubber the track up quicker . Then you would have at least 1 set left for a late race restart . Would cause a bit of strategy at the beginning with how soon to come in for the hard tires . Then , lets say there is a late restart with ~ 10 laps to go , with 15 cars on the lead lap . The top 10 take soft tires and the last 5 take the hard tires . Another caution comes out for a Nascar overtime . The 5 cars at the back of the lead lap that are on the hard tires pit for the soft . Maybe they can make a bit of a run on the final 2 laps . could make a interesting final laps .