A treatise on highway construction . scity is the only one to retain them on a large scale at the presentday. 134. Cobblestone Pavement.—Cobblestones bedded in sandpossess the merit of cheapness and afford an excellent footholdfor horses, but the roughness of such pavements requires theexpenditure of a large amount of tractive energy to move a loadover them. Aside from this, cobblestones are entirely wanting inthe essential requisites of a good pavement. The stones being ofirregular size, it is almost impossible to form a bond or hold themin place. Under the action of the traffic and frost the
A treatise on highway construction . scity is the only one to retain them on a large scale at the presentday. 134. Cobblestone Pavement.—Cobblestones bedded in sandpossess the merit of cheapness and afford an excellent footholdfor horses, but the roughness of such pavements requires theexpenditure of a large amount of tractive energy to move a loadover them. Aside from this, cobblestones are entirely wanting inthe essential requisites of a good pavement. The stones being ofirregular size, it is almost impossible to form a bond or hold themin place. Under the action of the traffic and frost the roadwaysoon becomes a mass of loose stones. Moreover, cobblestone pave-ments are difficult to keep clean, and very unpleasant to travelover. 135. Specifications for Cobblestone Pavement.—The following isthe common form of specification for this class of pavement: Stone.—The stones are to be the best selected water or bank,paving-stones, of a durable and uniform quality. 129 130 HIGHWAY COSrSTEUCTIOS-. TYPES OF STONE PAVEMENTS. FIG. 1. ROMAN.
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