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  • 1989 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.

  • 1989 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.

  • 1989 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.

  • 1989 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.