I have an opinion, and it may prove to unpopular, but I believe we have someone that may have extensive road experience (looks in the direction of
@Just-Thinking-51) to validate or refute my personal observations.
That being said, I think there are a few levels of technology that have added to the dilemma we're seeing. The first and main being, a lack of observation of the prevailing physical characteristics. It is my opinion that a lot of people are moving about via muscle memory and GPS technology. The drivers of today probably aren't as versed on observing the physical characteristics of their route. They are often following instructions or responding to commands ("in 1000 feet, turn left" or "in one mile, merge onto freeway such and such"), using routine "muscle memory" (I've made this trip several times so I know to turn at this sign) versus using personal observation ("oh, there's a gas station where I make this turn," or "the high voltage transmission lines take us to town center.)
As such, they are more accustomed to following the prompts instead of actively observing the many signs that are attempting to aid/alert them. They see the stop sign, but not the RR and grade crossing signs that preceded them.
This also impacts the old stand by of "Stop, Look and Listen." I routinely come to a stop at grade crossings. (only to get honked at and almost rear ended) because I am painfully aware of the fact grade crossing protection can, and does fail. At marked and protected crossing, I think people have been lulled into a false sense of security. When I approach, I brake, turn down my radio and roll down my windows as I approach the crossing, which leads me to my last point.
The reason I roll down my windows and turn down the radio, is to make sure I can hear the train if the protection has failed. The cars of yesteryear, may have been built like tanks, but the radios (by todays standards) were ludicrously low and "tinny." The cars of today are sealed, and drown out a lot of the outside noise. Combine that with a high powered audio system, and train horn that may be in between toots as you approach, and you may be in for trouble. Big trouble.
In closing, I think people are driving around on mental, cruise control.