I don't believe that all conditions need to be met. Rather, it is a list of conditions that could allow a crossing to be exempt. It also may not reflect a specific state's requirement, but is a more generic list.
The only crossings in Iowa that I've seen exempted have been on tracks that have been abandoned or out of service. There may be still tracks in use that have exempt crossings here in Iowa, but I've not seen any. And I've seen crossings on tracks that were used once a week*, but had no exempt crossings.
*On lightly used tracks, trains and engines approaching crossings with gates and/or lights must be prepared to stop and flag them until the lights/gates are seen to activate.
Jeff
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