This is a cue card. All Heck events (Le Grand du Nord, Heck Epic, and The Heck of the North) use these to guide riders through the course. There are rarely any other event signs, so you must pay close attention to your cues and use a functioning cyclocomputer. Here is how they work:
For easy access, I use a simple office clip, zip tied to my handlebar by the stem. It’s simple, cheap, and lightweight. You can find fancier holders, but this clip has worked for years.
When navigating, remember that all traffic laws apply to you, the cyclist. We do not stop traffic for Heck events. Use caution as if you were a motorist, but please stay far right on the road, especially when climbing blind hills. Assume a car is coming the other direction.
Finally, please do not litter your cue cards! Tuck them back in your pocket, bag or proper waste container. Thanks!