A chemiluminescent, multiple-part marking system comprising at least one first reactant and at least one second reactant, wherein the at least one first reactant is chosen from a viscous oxalate composition, and wherein the at least one second reactant is chosen from a liquid activator. The inhaler has a mouthpiece pivotally mounted to the base which carries a blister piercing element operable to pierce a blister received in said slot when the mouthpiece is pivoted relative to the base. The laser driver module is configured to convert the encoded data stream into a write signal including one or more edges. The crossover is positionable so that no portion of pipeline is placed into contact with the crossover. Further, the backrest unit includes two sleeves and a backrest rod, wherein the first sleeve is engaged through one rear leg rod while the second sleeve is installed on another end of the backrest rod to engage through another rear leg rod. Further, slope over the distance between the maximum point and the minimum point is obtained, and when the obtained slope is greater than a predetermined threshold value, it is determined that the target is a stationary on-road object.