triangle sight WESTBANK 视线三角形

vehicle stopping distance sight WESTBANK 车辆掣动视距

sight vane WESTBANK 砚板

sight hole WESTBANK 砚孔

sight line WESTBANK 视准线

sight distance WESTBANK 能见距离

sight wire WESTBANK 照准丝

sight rule WESTBANK 视准尺

sight tube WESTBANK 砚管