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A curved piece of clear plastic tubing (could be hose) with a bubble of air in it with a mirror so you could look ahead and see the angle without having to take your eyes off the road would be neat. Just thought of it, maybe I'll build one. Where I live the grades are very mild, with the worst being the Interstate overpasses, but when I get in the mountains my perception of grades is terrible.
regards
Mech
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