When you are doing a road race, it’s sort of required that you have a banner at the start and finish. We do a fair number of them every year! Here’s a picture of one we did for the Circle Program, a girls camp and mentoring program in our area.
Typically we use our Across the Street banner material, which is an extra heavy vinyl (16 oz) with an especially strong nylon cord re-enforcement layer. We sew extra material at the corners, and can put wind cuts in it.
Another feature of the material is that it will survive at -20 degrees F, especially helpful up here in the North Country of New Hampshire! The ski areas use this material a lot for outdoor banners.
It’s important to fixture banners like this properly. They are usually suspended from a steel cable going across the street with D rings through the grommets at the top. We recommend the bottom be tensioned with bungee cords, so the banner will rotate up out of the wind, and return to it’s full view when the wind stops.