If you do not have a permit, you can still access the area, but you need to exit it the same way you entered without driving through the permit gate.
Os nad oes gennych drwydded, gallwch dal gael mynediad i’r ardal, ond bydd angen i chi adael yr un ffordd y daethoch i mewn heb yrru drwy’r giât drwydded.