Highway hi-fi

Once, you could play record albums (you know, vinyl) while in your car … Highway hi-fi by Chrysler. Of course, you could not use standard LPs, but instead had to use a special 16 2/3 rpm format only from CBS records which played for an hour. Further, these records could only be played in your car. I wonder why this technology did not make it. A later version played standard 45 rpms, which seems more useful, (and could play a stack of 14). This format only lasted a year as well.