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Besides the obligatory turn signals with fendertop warning lights, the car is equipped with an AM radio, power steering and power brakes.

In hot weather there is a pair of under-the-dashboard vents to drawn fresh air into the cabin.

Beneath the hood of the 3,450-pound Plymouth a four-barrel carburetor feeds fuel to the engine that has performance cylinder heads. When downshifting while passing the automatic transmission leaves no doubt to the driver that this is a powerful car. It automatically shifts back to high gear at about 75 miles per hour. The speedometer tops out at at 120 mph.

Mr. Decker’s model of the Road Runner was by far the most popular version that Plymouth produced, a total of 49,549. The odometer on his second Road Runner indicates that 40,868 miles have been recorded. He believes that figure is correct but it has not been verified.

“You’ll like the sound of a lot of things on this car,” Mr. Decker tells people that his car attracts, “including the ‘beep beep’ horn.” He doesn’t mention the best sound the Road Runner makes, the one that comes tumbling out the dual exhaust trumpets. That’s a sound that was great in Topeka in 1969 and hasn’t lost any of its appeal in the last 37 years.