The only moving vehicle James Owen saw that night passed him by the Borges Ranch heading towards Vallejo. He saw no vehicle in front of him on Lake Herman Road as he traveled towards Benicia, and saw no vehicle entering the turnout from the other end as he headed towards it. He would have had an unobstructed view of the headlights and taillights of another vehicle amounting to at least 30 seconds traveling in either direction, before it entered the turnout. Therefore, when he passed the turnout, the vehicle parked only 10 feet to the right of the Rambler had been there for at least 30 seconds, but could have been sitting alongside the Rambler for a maximum of 8 minutes. This is explained in more detail in the article 'The Impasse on Lake Herman Road'.
The two raccoon hunters, Frank Gasser and Robert Connelly, exited the area at about 11:05 pm, with James Owen passing the turnout sometime between 11:10 and 11:14 pm, giving the Zodiac Killer a window of approximately 4-8 minutes to park in the turnout. The earlier he arrived, the longer his vehicle sat alongside the Rambler with no murder. The idea that the Zodiac Killer, having already forced the couple from the Rambler, then noticed James Owen approaching and hid David Faraday and Betty Lou Jensen behind one of the vehicles, is extremely flawed. Why didn't James Owen hear the shots fired at the Rambler if he was close enough to the turnout for the Zodiac to notice him approaching? James Owen mentioned no doors open on either vehicle, and never saw "anyone in the cars or around them". This would leave the Zodiac Killer having to close both vehicle doors before James Owen arrived, and then reopen the Rambler door before he left, as this was how it was found by responding law enforcement. It would also require Zodiac 'escorting' the couple back to the original position they exited the Rambler, before shooting them - because this is where the bullet casings were grouped. It is these bullet casings that gave rise to the notion they were killed immediately upon exiting the vehicle.
James Owen may have noticed both vehicles, but failed to notice the occupants. This would again rely on both Zodiac doing nothing the moment he parked alongside the Rambler, and David Faraday doing nothing for at least 30 seconds, when an unknown vehicle parked just 10 feet to his right in a dark lonely turnout. This is not the picture painted for the last 50 years. Had both vehicles been parked next to each other for several minutes before James Owen arrived, could we conclude that David Faraday knew the occupant/s of the second vehicle and therefore wasn't initially alarmed? Or were David Faraday, Betty Lou Jensen and the occupant/s of the second vehicle even in the turnout at this point in time? Either way, the narrative of a Zodiac Killer immediately acting upon his arrival at the turnout doesn't hold water. The double murder at Lake Herman Road on December 20th 1968 will probably remain the most puzzling of all the four Zodiac attacks, testimony to the brutality shown that night, and ultimately beginning a search that hasn't ended nearly a half-century later.