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alignment American Road Builders Amitrol application architecture Bureau of Public Colorado Springs Committee on Roadside cost Curve T Span cut slopes Deakin Department of Highways Department of Public effective erosion control fertilizer Freeway Garden State Parkway grade Ground-Cushion growth headlight glare HEADLIGHT-GLARE SCREENING height of cut herbicides Highway Department highway design Highway Research Board honeysuckle humanized back hydrated lime Ilex glabra interested Iurka Japanese Honeysuckle land units Landscape Architect LANDSCAPE DESIGN PRINCIPLES Landscape Engineer lb per acre locations maintenance Median Planting minimum rounding MODERN HIGHWAY Monuron mowing equipment mulch native weeds nitrogen Noise Control noise levels nutrients Palisades Interstate Parkway phosphorus plant material ponderosa pines problems PROJECTED HORIZONTAL DISTANCES Public Roads rainfall Route Route 39 seedbed seeding seedling semi-arid region shrub plantings Simazine Simonson SLOPE AND ROUNDING soil Span Radius ft standards Symbo1 Mower Curve topsoil traffic noise triazole ureaforms Viburnum Washington Weed Control Wilbur H