Show By 1972 ONE OI OF THE TilE principle sources of increased highway high maintenance costs is the work required to keep four lanes interstate interstate interstate in in- and primary sections of oC highway in first class elass condition condition condition con con- said Mr West This expensive upkeep is particular particularly particularly lar noticeable during the I first year car after alter the project is completed Weak spots in construction con con- conI I sti usually show up during during dur dur- ing this period I dur-I |