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Only the first miles of Geology Tour Road are normally passenger-vehicle accessible; the loop beyond the signed threshold has deep ruts and soft sand where 4WD and high clearance are recommended.
Continuing beyond the signed turnaround in an unsuitable vehicle can lead to immobilisation on a route that excludes campers, trailers and motorhomes.
Planning response: Use a suitable high-clearance 4WD for the full loop, check current park conditions and turn around at the signed threshold in any other vehicle.