A Policy on Grade Separations for Intersecting Highways |
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Common terms and phrases
1-way ramps 3-lane road abutment added lane alinement approach roads arrangement assumed design speed barrier curb bridge cloverleaf construction cost cross road cross slope curvature deceleration lane desirable direct connections direct left turns divided highway drivers edge of pavement entering entrance curve exit curve exit turns gradients grading plan inner loop interchange interchange roads intersecting roads Intersections at Grade island left-turning movements length located lower left major road median strip ment minimum minor road necessary operation outer connection overcrossing paths percent pier Policy on Intersections quadrants radii ramp design ramp pavement ramp terminals reverse curves right turns right-of-way roadway rotary Rotary Intersections SCALE IN FEET separation with ramps service roads shown in figure sight distance signs span speed-change lanes superelevation T-type tangent taper terminal curves terminal islands tion traffic density traffic lanes traffic signal control traffic volumes turning movements turning traffic undercrossing vertical curve widened