hburke01, the rule for high school teams is very similar. From the AACCA high school rules:
9. Prior to the performance of any skill, the immediate environment for the activity should be taken into consideration including, but not limited to proximity of non-squad personnel, performance surface, lighting and/or precipitation. Technical skills should not be performed on concrete, asphalt, wet or uneven surfaces or surfaces with obstructions.
If the track around the football field is a rubberized track, as many now are, that is considered an appropriate surface for stunting and tumbling. Schools that still have an asphalt track should not be. The problem, of course, is enforcement. There are many states and/or school districts that don't require their high school teams to follow a particular set of rules. And, sadly, there are many coaches and teams who simply choose to ignore them. In this state, penalties for documented violations of safety rules are stiff (they can escalate as far as a high school losing all interscholastic sports), so people don't break the rules. Until other organizations take it as seriously as a few do, rule breaking and associated injuries will continue to happen.