Fireturd has two bridges. One crosses over the race track about 1000' beyond the finish line. It continues over the return road beyond that to the East. Although it used to be open during the races to get spectators from the parking lot into the sportsman pits, they have since parked people in another city and let they walk around the lake to enter the facility virtually closing any need to use that crossover bridge.
There is another bridge that's always open over the staging lanes from the vendor alley to the bleachers.

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"The Doctor"
www.wannaberacing.com

Didn't Eddie Hill have a couple "through the lights" blow overs, too? It would be very ugly to see a car in that situation get wrapped around a bridge. On the other hand... that would be a friggin awesome place to watch runs. They could make a killing on those tickets. I've been on a bridge during a Champ Car race before and it was really impressive.

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On my arm until the day I die, but in my heart forever

Could be Joe, I didn't make it there last year, But I remember the Goodyear bridge crossing from the end of the parking area by Bob Bondurant's over the shut down and return road. Never went any further, I got some pics, I'll have to look.

I remember an article back in the day (late 70's- early 80's ) in SS&DI (still ) that had illustrations of that same concept- very oriented around football style stadium seating and a roof. The article came around the time that noise restrictions were just starting to become big news... Someone please help me with my C.R.S. disease and let me know that article did run somewhere....

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"Run what u brung, and hope u brought enough...."
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Far out! And you can't tell me that between Evan Knoll, Don Shoemacher, Connie Kalitta and Bruton Smith this couldn't happen!

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On my arm until the day I die, but in my heart forever

Wow - that's an idea. Actually I have had this same idea every time I sit through a rain delay... At the very least, how about having the grandstands covered? It'd make waiting through delays much more pleasant (vs wandering the pits and trying to find trees) and would be much better for the sunburn situation when the weather is good.

As far as noise, vibration, and fumes, I don't even think a complete dome is needed - maybe have covered grandstands and cover the track but have both ends open and some room between the track and stands to allow noise and fumes to dissipate. It'd provide pretty good (not complete, but better than now) protection from the elements for fans and racers alike. And with the track covered, the issue of only 1 night-time qualifying shot would be decreased (no sun beating down on track = more consistent temps = more consistent runs = racers finding something ELSE to whine about )

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“One day when I was walking through the pits,” Millican said, “Evan said he wanted to talk to me. ‘Do you know how many millions (of dollars) I’ve spent to beat you?’ he said. ‘Since I couldn’t beat you, I’m going to own you.’ "