If you are planning to do the work with a volunteer crew, certain areas may be unadoptable due to safety considerations. However, if work will be done by a professional contractor, most areas will be open to adoption. Access to work areas is unsafe. The work area is unsafe without traffic control. The shoulders or roadside are too narrow.
Visibility is too restricted.
Construction or other work is under way or planned. Traffic is too heavy or too close. Vehicle runoff potential is too high. Terrain is too rugged or vegetation is too dense. There is no area available or appropriate for planting.