Not necessarily. Crossbuck Railroad Sign may be passive or active. When the sign  is supplemented with red flashing lights or red flashing lights with a pivoting gate that lowers down, it is called active crossbuck. Whether or not to install the lights and gates along with the crossbuck railroad sign at a grade crossing is determined by the state Department of Transportation. Usually, the active warning devices are installed where: - Trains run at medium to high speed, - Train traffic is frequent, - Highway traffic is high, - Accident-prone crossings - School zones - Sight distance is restricted for motorists