There are two quiet zones near me in Edison NJ. They are about a half mile apart on the ex-LV main line. When these crossings were made into QZ, barriers were installed in the roads center and all four sides. An effective cattle chute for cars. They are complete with lights, bells and gates. One crossing is a busy county road. After about 4 years the feds decided to overturn the quiet requirement and horns sounded again.
Smart move.