Concrete highway traffic barricade having integrally formed coupling

In a traffic barrier of the type wherein a series of elongated precast concrete barricades having a uniform cross-section along their respective lengths are joined in end-to-end interengaging, abutting alignment by similar mating tongue-and-groove couplings integrally formed in the respective abutting ends of each of the barricades, each tongue-and-groove coupling consisting of a vertically elongated tongue projecting longitudinally outwardly from the end of one of the abutting barricades and a recess complementary to said tongue being formed in the end of the other of the abutting barricades, said recess extending downwardly to the base of the barricade to permit entrance of the tongue in a vertical direction, the transverse width of the tongue and the recess being greater at their lower ends than at their upper ends to facilitate said entrance.