Toyota prius Owner's Manual page 528

5-2. Steps to take in an emergency
CAUTION
 When the compact spare tire is attached
The vehicle speed may not be correctly detected, and the following systems
may not operate correctly:
 ABS & Brake assist
 VSC
TRC

 Cruise control (if equipped)
 Dynamic radar cruise control (if equipped)
 Pre-crash safety system (if equipped)
 EPS
 Rear view monitor system (if equipped)
 Intelligent parking assist system (if equipped)
 Navigation system (if equipped)
Speed limit when using the compact spare tire

Do not drive at speeds in excess of 80 km/h (50 mph) when a compact spare
tire is installed on the vehicle.
The compact spare tire is not designed for driving at high speeds. Failure to
observe this precaution may lead to an accident causing death or serious
injury.
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