2b. All energy used to propel the vehicle must be stored in common, commercially available, batteries labeled with their voltage by the manufacturer. Batteries must be impounded with the vehicle, but they need not be installed until immediately prior to the run. The vehicle may use any combination of batteries and/or battery packs with a maximum voltage output of 6 volts to propel it. All sources of power shall be in a location as to be available for inspection and/or measurement by the event supervisor.

Under Competition add h. Contestants who fail to bring and wear approved Safety Spectacles with Side Shields will not be allowed to compete (See: http://www.soinc.org/general protection.