PHA events are operated under the PHA Supplementary Regulations:

2026 PHA Supplementary Regulations

Driver and Car Safety Rules for all classes are defined in the PHA Supplementary Regulations Document linked above.

Car Preparation Rules are defined in the following documents:

• SCCA GCR Classes are defined in the current SCCA General Competiton Rulebook (GCR).  All classes listed in the current GCR (National and Regional) will be accommodated.
• PHA Supplemental Classes are defined in the PHA Supplementary Regulations Document linked above.
• Solo and Time Trial Derived Classes are also defined in the PHA Supplemental Regulations Document linked above.

NOTE on the  Solo and Time Trial Derived Classes category:

• • For Solo derived cars, refer to the SCCA National Solo Rules for Car Preparation, and the PHA Supplemental Regulations for Safety.
  • For Time Trial derived cars, refer to the SCCA National Time Trial Rules for Car Preparation, and the PHA Supplemental Regulations for Safety.
  • Some GCR derived cars can also run in these classes — see PHA Supps for list.  For these cars, refer to the current SCCA GCR for Car Preparation, and the PHA Supplemental Regulations for Safety.

NOTE on SCCA Time Trial Classes at some PHA track events:

For some of the PHA track events, the National SCCA Time Trials classes are  included as “Event Supplemental Classes”.  Refer to the event description for each event to determine if National TT classes are permitted.

In the case where National TT classes are listed as Event Supplemental Classes for a PHA event:  for TT classed cars, refer to the SCCA National Time Trial Rules for Car Preparation and Driver and Car Safety.  In other words, at these events, TT classed cars do not have to meet the more extensive PHA safety requirements.

Also note that for these events, a TT classed car that meets all of the PHA Driver and Car Safety requirements may compete in either the TT class, or in the appropriate Solo and Time Trial Derived class as defined in the PHA Supps.