Vehicles Carrying Explosives Post Mount Sign- Dia. 622.8 R2/RA2 (Face Only)The no explosives sign diagram 622. 8 stops vehicles that carry explosives from using the length of road. This should be in areas where explosives are commonly transported. This sign will be required in more densely populated areas where any explosions would have greater consequences, such as urban or residential areas close to manufactures handling explosive materials. If this area also falls within an area which produces natural gas then this sign