Yellow means danger. No overtaking.
6 seconds sound clip from the Le Mans (1971) movie soundboard.
You can hear this line at 00:17:51 in the Blu-ray version of the movie.
Quote context
[...]
- No one may drive more than four consecutive hours.
- For the first time in the history of this race...
- Yellow means danger. No overtaking.
- The race will start 4 pm. Saturday and finish 4 pm. Sunday.
- The car covering the greatest distance in 24 hours shall be the winner.
- In the case of the faster cars, this will mean a distance in excess of 3,000 miles.
- And so, ladies and gentlemen, welcome to the most famous motorcar race in the world.
- The 38th running of the Grand Prix of endurance and efficiency. The 24 Hours of Le Mans.
[...]