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adjacent ahead amount of fertilizer asphalt automobile beauty Bermuda grass Boone for Texas bridge broad building built Carpenter ants concrete condition contour lines cross crown culvert curves danger deep ditches distance driver driver's eye economy effect erosion esplanade fills flowers grade separation grass grow growth Gubbels heavy highway construction Highway Engineer HIGHWAY Texas hill hilltop hundred feet inches insects landscape engineer leaves location and alignment maintenance miles an hour modern highway motorist mowing native trees natural trees necessary old highways pavement planting possible preserve principles problem pruning Pruning saw reduce retards right angles right-of-way rip-rap road focus roadbed roadside development roadside park roadside trees root system route safety shrubbery side ditches slopes speed steam shovel steep straight stream structure surface Texas Highway Department tion top soil traffic transplanting trees and shrubs turnouts underpass valley vegetation velocity vision width