Re-reading the post, I must clarify. Seatbelts were mandated in 1967, AFAIK. Seatbelt buzzers probably haven't been mandated ever, as it's possible to disable them in some vehicles.

And speaking of seatbelts: I was going through the gate at the military installation in which I work about two years ago. The gate guard asked me to pull over to the side so that he can search my vehicle. I said sure, but what exactly are you going to "search." He just shrugged his shoulders and said that they were doing a mandatory random vehicle search. They were searching every third vehicle through the gate and I was the third vehicle. After telling him searching every THIRD vehicle wasn't RANDOM, he got short with me and told me to pull over to the side. While over there, he actually asked if I had my seatbelt fastened, as it was on his checklist of the things to check! Again, he wasn't happy with me after informing him that motorcycles don't have seatbelts.

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