Permit holders must apply for special permission if they wish to travel by automobile, bring in goods or stay overnight in the seam zone. Even those holding permanent or personal permits are limited to crossing the barrier at the single gate specified in the permit. Personal permits granted, including those issued to farmers who wish to access their land, are often only valid for a limited period. Access to the seam zone for permit holders is further limited by the specific operating regimes of the gate in question. Procedures and their opening hours differ from gate to gate and are not always entirely predictable.