Interest is increasing among builders all over the world in the fine economic potentialities of precasting many concrete elements right on the job site, using ready mixed concrete. The technique is in use in the construction of a pedestrian subway in England. The panels were all precast above ground on the job site and then picked up by crane and lowered into the open excavation. Projecting stirrup reinforcement was then cast into the sides of the panels. During mounting these stirrups are bent out. The units are then arranged so the alternate sections face opposite ways for the stirrups to mesh into each other. The subways are finished with a granolithic floor topping. The system is said to result in substantial savings in comparison with either factory precast or conventional cast in place construction.