I support a general tag for hill crests with sufficient vertical curvature to introduce a visibility, grounding, or takeoff hazard. It could be applied to railroad crossings, humpy bridges, or just roads traversing hilly terrain; all of these situations can be found in central Ohio. Using this tag on a node at the crest of the hill should be acceptable, as the hazard may occur (potentially in multiple places) along fairly long way.
PS — the american MUTCD has a warning sign for vertical curvatures that may cause long vehicles to ground. David K
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