This testimony by NIOSH suggests certain modifications to sections of the Mine Safety and Health Administration proposal to revise certain sections of Title 30 of the Code of Federal Regulations. The modifications concern electric mine lamps other than standard cap lamps and mandatory safety standards for surface coal mine and surface areas of underground coal mines. NIOSH suggests that the proposed language in the latter section be modified to require that pickup trucks with an unobstructed rear view be excepted from the automatic warning device provision only if they are equipped with functioning back up lights. NIOSH further cautions that the use of strobe lights may have certain detrimental effects on the human eye, such as temporary blinding, and that certain strobe frequencies may cause disorientation in human subjects. The use of proximity equipment such as infrared, ultrasonic, and radar devices has merit and caution should be exercised in the power emitted by such devices concerning possible interference with other electronic equipment, radio communication and remote detonating devices.