Drawbridge wasn't planned on being as springy or with that material in mind. We tried opening it for teammates by crossing over other defenses and ramming it down, but it was so springy there was almost no time before our robot either fell off of it or was flipped back by it.
What's actually interesting in the stats is the rough terrain.
It actually (to my surprise) scored a third in least-crossed, but unlike the sally port and drawbridge, it had a really high success rate. Perhaps because few robots tried it but those who did knew they would get over? It became one of the staple defenses that our robot could do (one of the few). What was even more surprising was the moat and the sally port. I would have assumed that the sally port would be damaged more often, however it usually required at least two robots (one to open it from the "wrong" side and one to follow through for the damage point) even though in scrimmage it didn't seem to be an issue for most bots. Another one was moat. For some reason we (and other teams) were having trouble crossing it even though again in scrimmage it was fine. Teams (unless they were built with treads or LARGE wheels) gave up on it (perhaps the ramp angle on the moat was different or etc) after attempting and failing once. Low bar was great, but they had to remove the fabric.