Final answer:
One of the six parts of operating at restricted speed with extreme caution is maintaining the ideal speed.
Step-by-step explanation:
One of the six parts of operating at restricted speed with extreme caution is maintaining the ideal speed. The ideal speed refers to the maximum safe speed at which a vehicle can turn on a curve without relying on the friction between the tire and the road. By adhering to this ideal speed, the vehicle can maneuver safely without compromising its stability and control.