People have cell phones, so they can call for help if the car breaks down, instead of getting in the brown van with the killer who was driving around looking for victims.
I can only imagine the range of emotions if your car broke down on the highway in the 50s or 60s. Especially if you were black.People aren't as naive compared to those back in the 70s & 80s.
Most serial killer victims more often than not were gullible/naive individuals who trusted a stranger for help, when you look back at some of these serial killers you'll notice most of them easily talked their victims into a trap by just offering a ride or even luring them somewhere.
People nowadays aren't so naive and gullible to just jump inside somebody's car when offered, which is also why potential/undercover serial killers of today have trouble getting victims because people gotten smarter over the decades.
And, when you really think about it, it is just crazy that hitchhiking was ever a thing. Just picking up absolute randoms on the side of the road trying to go wherever.