类型	安装方式	代号	适用车辆
A	磁吸式	A	载质量1t（含）以下，用于城市配送车辆
B	顶檐支撑式	B1	载质量2t（含）以下
		B2	载质量2t-15t（含）
		B3	载质量15t以上
C	金属托架式	CⅠa	带导流罩载质量2t（含）以下
		CⅡa	带导流罩载质量2t-15t（含）
		CⅢa	带导流罩载质量15t以上
金属托架式按底平面鱼标志灯基准面的夹角分为三种，分别为30°、45°、60°

Types of signal lights

Type	Fixing method	Number	Applicable automobiles
A	Magnetic attraction	A	Automobiles used for urban goods distributing wiht the load of 1t (including 1t below)
B	Root structured	B1	The load of 2t (including 2t below)
		B2	The load of 2t-15t (including 15t)
		B3	The load of over 15t
C	Metal moving brideg	CⅠa	With streamlined dome.The load of 2t (including 2t below)
		CⅡa	With streamlined dome.The load of 2t-15t (including 15t)
		CⅢa	With streamlined dome.The load of over 15t
Metal moving birdge style can be divided 3 kinds,i.e.30°、45°、60°，according to the angle between the bottom plane and the signal datum plane.