Show DAMAGE DONE TO HIGHWAYS Public Roads Bureau Experimenting With Matter of Impact on oni i Various Surfaces Surface A new series of experiments which may have a reaching far effect upon transportation on the highways and the regulation thereof has bas been undertaken undertaken un un- un by the bureau of public r roads ads department of at agriculture c The work which Is being done by bythe bythe the Ule division dI of or road materials test and research Is 18 designed to demonstrate demonstrate demonstrate demon demon- strate the damage done to highways by different forms of at transportation units traveling tra under varying condl- condl It Is thought that the infer infer- 1 matlon mation so obtained will perhaps serve as ja a basis for scientific r regulation o of I |