Throughout the course of an IndyCar Series race, there are going to be accidents. 
The racing is fast, intense and risky, 
so when it goes wrong, we all need to follow the rules to maximise safety.
When the race officials spot an accident or any debris on the track, 
they’ll wave the yellow flag to start a caution period, which means we need to slow down to keep it safe. 
As well as the flag, the trackside lights will turn yellow and the caution light appears on your steering wheel.
As soon as the yellow flag is shown, the pace car will leave the pits to hook up with the race leader.
Passing is not allowed under yellow, so don’t worry about the guys behind you. 
But remember this applies to you, too. 
The car you have to follow will be marked by two green chevrons. 
Make sure you stay behind this car or you’ll be black-flagged and have to serve a penalty in the pits, losing valuable positions.
The pace car driver will wave cars on until he’s got the race leader behind him. 
If you’re waved past, you can speed it up to get around the track and rejoin the back of the pack.
Once you’re in the pack, you have to maintain close formation until the restart or until you decide to pit.
Remember, if the leader pits, 
then you should pit to stay in sequence unless you’re gambling for another caution period later 
and decide to stay out and make up some laps.
If there is debris on the track, then the IRL track safety crew will come out to clean up. 
Once the track is clear and everyone’s packed up behind the pace car, the race can restart.
The pace car will exit at turn one. 
It’s then up to the race leader to take the pack round to the restart zone. 
The restart zone is located near turn four. 
If you’re the race leader, remember to keep to pace lap speed of around 100 miles per hour or you’ll be black-flagged.
As soon as the race leader enters the restart zone, it is up to him to bring the pack up to race speed. 
This is his advantage. 
The second he floors the throttle, the chief starter will wave the green flag, and the race is back on. 
Unlike the start of the race, as soon as the green comes out, that’s it, race on, you can pass – 
even before the start-finish line.
If your reflexes are good enough, you can make up several places during a restart, as you floor the throttle before the guy in front.
Dummy
Now it’s your turn to take part in the caution period and race restart. 
You won’t be leading the race when the yellow flag comes out, so when you approach the pace car, you’ll be waved on. 
Get around the track and take up your place in the pack up.
Remember not to pass while the yellow flag is out. 
Maintain position until the green flag comes out, 
and then try to make up as many places as you can before the time runs out. 
You need to make up at least one position to pass this test.
Three, two, one, GO!
That’s an OK restart; can you make it any quicker next time? Bronze.
Good restart. Silver award.
Excellent restart. Gold medal. Try to keep that sort of performance up!
Not good. You need to really concentrate during a restart to ensure you don’t lose positions.
During a caution period, the pits are initially closed, 
but as soon as the pace car has gathered the field behind it, 
the pits will reopen, and you can then pit under yellow. 
If you do pit, you may lose your position and will have to rejoin toward the back of the pack, 
but bear in mind that it’s easier to make up positions than it is laps, 
which is something you’ll probably have to do if you’re unlucky enough to have to pit during a green flag.