Contrast that with the success in filming the "helicopter bridge" scene in Terminator 2. This snip from my book The God Machine:
During a night-time chase scene, a Bell JetRanger dips down -- bringing its skids nearly to the pavement -- to fly under an overpass. It was director James Cameron's idea. Veteran pilot Chuck Tamburro put his helicopter on wheels and rolled it under the bridge to measure the clearance (five feet above and four feet on each side). He flew the stunt twice at a speed of sixty knots. No special effects were used.
Tamburro told me he just followed the highway stripe and by keeping the skids barely off the pavement, had all the cues he he needed for a safe flight.
Tamburro has a cameo earlier in the movie, when the T-1000 tells a pilot to jump out of a hovering helicopter. That's Tamburro.