4 A SUMMARY OFACCESSIBILITY STANDARDS FOR OUTDOOR DEVELOPEDAREAS accessibility standards for Federal outdoor developed areas Conditions for Exceptions  The ABA Standards recognize the existence of constraints and limitations in the outdoor environment and allow for exceptions from specific provisions in the technical requirements where certain circumstances, referred to as “conditions for exceptions,” apply. When an entity determines that any of the conditions for exceptions do not permit full compliance with a specific provision in the technical requirements, compliance with that provision is required to the extent practicable. The phrase “to the extent practicable” means reasonably doable under the circumstances. The conditions for exceptions should be used only after all other design options are thoroughly explored. Where a condition for exception applies to only part of a trail, a beach access route, or an outdoor recreation access route, the rest of the trail or route must comply with all the technical requirements for the trail or route. The following sections describe the four conditions for exceptions and provide examples of situations where they might apply.