The Red, Yellow, Green Traffic Light Race Pacing System For Runners If They Start A Race Too Faster or Don’t know Their Fitness
You’re at mile 18 (km 30) of a marathon, and everything starts to hurt. Your brain is now lightly whining to you like a three-year-old on a long car ride: “Should I push through? Should I slow down? Am I about to blow up, or am I just being soft?” Not painful enough to make you stop, but irritating enough to make you question life choices.
Most runners either push themselves into a death march or play it so safe they finish wondering if they left too much in the tank. Neither is a great ending.
Here’s a silly-simple framework I’ve used for years that kills the guesswork: Red, Yellow, Green
I usually set three race goal times: A (ideal), B (realistic), and C (minimum acceptable). I only share goal C publicly but start the race aiming for goal B. I then use the red, yellow, green system to adjust my pace during the race, aiming to move up to goal A if possible or settle for goal C if needed. This approach assumes your race pace is validated with training, dress rehearsals, long runs, and the VDot calculator.
What It Is
Split your race, long run, or workout into sections—thirds are easiest to manage. At the end of each, check in and assign yourself a traffic light:
- Green = Feel good. Speed up.
- Yellow = Feel meh or unsure. Hold your pace.
- Red = Feel rough. Slow 5–10 seconds per mile and reassess in 5–10 minutes.
Think traffic lights for your body.
Choosing Realistic Goal Times For Races
I also usually have three race goal times: goal A, goal B, and goal C. I tell everyone goal C and aim for goal B when I start. Then I use the red, yellow, green system to move up to goal A time or drop down to goal C time.
And this assumes your race pace has been validated through training, dress rehearsals, long runs, and the VDot calculator.
How It Works (Real World Scenario)
Let’s say you’re running a marathon. After the first 10 miles (16km), you check in with yourself. Feel strong? Green light—bump the pace slightly into your goal, a race pace. This is built for negative splitting, so you’re using that strength wisely.
At mile 15 (km 25), legs feel heavy, breathing harder. Yellow light—hold steady, don’t do anything risky.
Mile 20 (km 32) hits, and you’re dying. Red light—drop 15-20 seconds per mile (10-15 seconds per km) down to the goal c race time. You then give it 10 minutes, then reassess.
Sometimes (if you’re fit enough and the course isn’t too hillly/windy/hot) backing off just a tiny bit for a few minutes lets you recover enough to finish strong instead of crawling. On long races, that slight slowdown won’t nuke your best time attempt, and you’ll learn how to push and pull through pain with the levers of smarter pacing.
In training, your variables change. Racing = pace, heart rate, effort. Training = sleep quality, stress levels, soreness, and how well you actually recover.
When to Use It
Best for races where you’re not totally sure you’re fit enough for your goal time, especially if you weren’t able to fully execute a training block or are coming back from time off.
This also works on long runs where you’re testing fitness and training runs where you want to practice decision-making under fatigue.
The Traps
This isn’t perfect, as you can always lie to yourself and always pick yellow or red to avoid discomfort. You can also go into David Goggins “Stay Hard” mode and ignore the fact that you only had 3 weeks of proper training for this race, and catastrophically blow up during it.
It might also not work as well in short races if you run a faster 5k (faster than 20 minutes), as there’s less time to adjust in a 5k. But, I’ve found it does help me in my 5k races (I run between 16-18 minutes most of the year) as I struggle in the last 1/3 of a 5k and this helps me feel like I can adjust on the fly. Do you.
And it’s not a substitute for smart pacing or proper training, as I said before (worth mentioning again for the people who skimmed this).
I still think this system still beats YOLO winging it and hoping your lizard-just-hit-the-wall-brain makes good choices at mile 22 (km 35)… spoiler, it won’t.
Simple system, less chaos, better decisions: Red, yellow, green.
