Quite a few events now need to restrict car numbers. The recommended method is to use Class. Create one for Driver and one (or more) for Passenger and other transport modes. Set the Entry Limit on the Driver Class to the number of parking spaces available. Leave the Entry Limit on the other Classes as zero (unlimited).  In Entry Form – Standard Items include classID as mandatory and give it a low number for display order (say 5). Do not include it in the Public start list. If you need to collect car reg, Include the VRN question in Entry Form – Standard Items.

This technique relies on honesty!

To display the entry numbers for these Classes tick this: