Kathleen Johns traveled with another adult, who drove her near to, or by Patterson Police Station (where she just happened to spot a picture of Zodiac who resembled her abductor), then drove the vehicle back to the predetermined location, disabled the vehicle and set it alight, taking the car keys with them. The police never recovered the vehicle's keys.  Kathleen Johns was rescued by the good Samaritan and taken to Patterson Police Station, while the person who traveled with her remained near the vehicle. Once Kathleen had been rescued, the accomplice grabbed the car keys, then disabled and set fire to the vehicle.  Kathleen Johns was telling the truth, and she truly is a victim here.
But we have to consider the story told in Robert Graysmith's book: "Kathleen gathered up Jennifer and got into the man's car. Just as they were pulling out, she noticed that the lights to her car were still on and remembered that the keys were still in the ignition. The man smiled, went back to her car, snapped off the lights, and pocketed the keys". Despite him being friendly at this juncture, she failed to ask for her keys?
From San Bernardino to Bird Road is 368 miles. It would take just over 6 hours traveling non-stop at 60 mph to reach Bird Road. That would place Kathleen Johns being pulled over at around 10:00 pm. But she was driving a "clunky" 1957 Chevrolet station wagon and was pregnant with a small child in tow. It likely took longer. We will allow an hour extra (7 hours journey time), which give or take a few minutes, would mean that an approximate 4:00 pm departure time, has her traveling towards Bird Road around 11:15 pm. However, did the truth come out when relaxed and being interviewed by Robert Graysmith at a later date, when she was far more detailed : "Kathleen Johns bundled up her ten month-old daughter, Jennifer, and left her home in San Bernardino at 7:00 pm for the trip to Petaluma, a small dairy-farming community, where her sick mother lived. It was easier to travel at night while the baby slept".
If this was the true time, it would make the abduction claim virtually impossible. A 368 mile journey with such a vehicle, in her condition, could only be achieved in just over 4 hours (7:00 pm to 11:15 pm), if you were traveling at 86 mph non-stop. But if you took 7 hours (as described above), then you would arrive at Bird Road on Highway 132 at around 2:00 am, the approximate time she was 'rescued' and taken to Patterson Police Station, thereby making the abduction story now fiction. She is either driven by her accomplice to Patterson Police Department (20-30 minute journey), who drove the vehicle back, or she is picked up by the good Samaritan from Missouri and taken to the police department. Either way, she would now arrive at the Patterson Police Station at 2:30 am. The time recorded by Sergeant Charles J McNatt.