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Man the way some guys drive their sleds nothing would stop em, even a wall.I use the polars with the extension flags. There has been several close calls with sleds, the extension flags is easy to see when tripped. I would go with a light solution to your problem.
I saw a guy use orange pylons. I really don't like that idea What about you guys?i thought about 3/4 in pvc tubing spraypainted a flourcecent color or have some surveyors tape on them. Maybe make them about 18 -24 inches.