You're running fifth in a race. Out of nowhere, every flag station you pass is showing two yellow flags. Something happened somewhere, and now you have to slow down, stay put, and wait.
That's a full course yellow, or FCY. It's the most common way a club race gets neutralized, and new drivers get it wrong more than almost anything else. Here's what it means and what to do.
What is a full course yellow?
It means the entire track is under caution, not just the corner where something happened. The SCCA General Competition Rules (2026 edition) define it as double yellow flags "displayed at all stations," and the instruction is short: "SLOW DOWN, NO PASSING."
The flag stations near the problem will show a standing or waved yellow. Once a station clears its incident, it switches to double yellow. So you may see several different flags before you reach the trouble. The requirement stays the same the whole way around.
Our racing flags reference covers every flag. This post is about what the double yellow asks of you.
Who decides to throw one?
Officials do, not drivers. In SCCA racing, the Race Director or Chief Steward can use a safety car "as necessary to control the field and to assure expeditious restarts." A safety car only enters the course under double yellow flags.
If you want the quick version of why: an incident needs room for workers and tow crews, and a slow, bunched field is the safest way to give it to them.
What do I actually do under FCY?
Think of it as five jobs, in order.
- Lift and slow down. Reduce speed right away. Don't wait to see what happened.
- Do not pass. No passing anywhere on track, even if the car ahead is slow.
- Close up. The GCR says all drivers "must make every effort to safely catch the field as soon as possible to form a single and evenly-spaced line" behind the safety car or leader.
- Hold the pace. Match the safety car's pace and keep your position. You can't improve it, and you can't start racing until the green comes out.
- Get through the incident under control. The rules say all cars must pass any on-track incident "well under control."
The first one sounds obvious. The third is the one people skip.
Why closing up matters
SVRA's flag guide calls failing to close up "a common problem" for vintage drivers. They ask everyone to "pack up" behind the car in front so the restart is safe and clean.
If you hang back with a three-second gap, the restart gets messy. The cars behind you bunch into the back of you, and the cars ahead take off. Weave a little, warm your tires, but stay within sight of the car in front.
If you're curious why warm tires and brakes matter before a restart, our post on cold tires vs. warm tires explains it.
What about the safety car and the lead car?
The GCR describes two setups:
- A safety car is out. The lead car slows the field smoothly, keeps pace with the safety car, and doesn't balk the field. It then holds the safety car's speed down to the restart.
- No safety car. The lead car slows the field so everyone can bunch up single file behind it. It holds a steady pace "appropriate to the track conditions."
You may not pass the safety car unless an official waves you by. The rules say a car that passes it without being directed "may be black-flagged into the pits." The field also follows the safety car as long as its emergency lights are on, even if it leaves the usual course. See what happens when you get black-flagged if that ever happens to you.
Before the restart, the safety car holds the pace, turns off its lights, and exits. That's your cue that the green is coming. The restart works like the one at the race start. Our post on rolling starts vs. standing starts walks through it.
Can I pass anything under FCY?
Only two things. The GCR says cars "may carefully pass emergency vehicles and other cars that are disabled or off pace." SVRA says the same: drivers may carefully overtake emergency vehicles and cars in distress at non-race speed.
If your own car is hurt and can't keep the pace, don't hold up the field. Raise an arm, pull to the side, and stay well off the racing line. Other drivers can then pass you safely. Head for the nearest corner station, or pit at the first chance.
Common mistakes
- Racing the next car "just a little." Gaining a spot under yellow can cost you a penalty and, worse, put a worker at risk.
- Leaving a huge gap. Close up. A good restart depends on it.
- Not looking up the track. The incident may be around the corner. Slow down before you see it.
- Treating FCY as a break. Stay sharp. The field is bunched, and a restart is where contact happens. Our first wheel-to-wheel race guide covers that moment.
Does it work the same at a track day?
Not quite. At an HPDE, you're not racing, so there's no order to protect. Instructors and workers still use yellow flags to slow everyone, and passing is already limited to point-bys. When something blocks the track, sessions often go to a red flag, as we describe in what happens if you crash at a track day.
What I couldn't verify
The procedure above is SCCA's, taken from its 2026 rulebook. I couldn't pull NASA's current competition rules, because they sit behind a members login. Other clubs word things differently, and some don't use a safety car at all. I also couldn't find FCY procedures published for High Plains Raceway or Pueblo Motorsports Park. Read your series' rules and your event's supplemental regulations, and listen at the drivers meeting. Nothing here is a substitute for them.
Sources: SCCA 2026 General Competition Rules, Sections 6.1.1, 6.5.2, and 6.6 (November 2026 edition), SVRA: Racing Flags As Used In SVRA Vintage Racing, Apex This iRacing League: Full Course Yellow Procedures. Checked November 2026. The SCCA quotes come straight from the rulebook; the iRacing league page is a sim league's procedure and is cited only for how a frozen order works in general. Your series and event rules come first.
If you want a place to write down what you learned from each session, the free Race Day Ready Pack has a post-session debrief sheet and a setup tracker.
Do you believe?