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Complete guide to valley (sag) curves in highway vertical alignment. Four types, night headlight sight distance criterion, comfort criteria, cubic parabola design, and comparison with summit curves.
Detailed guide to summit curves in vertical alignment. Covers all 4 types, why IRC uses square parabola, VPC/VPI/VPT positions, deviation angle N, and complete length formulas for SSD and OSD.
Complete IRC gradient table for highway design. Ruling, limiting, and exceptional gradients for plain/rolling, mountainous, and steep terrain with design rules and drainage minimum values.
Complete guide to vertical alignment in highway engineering. Covers gradient definition, four types (ruling, limiting, exceptional, minimum), effects on traffic, grade compensation formula, and IRC rules.
Complete guide to transition curves (clothoid/spiral) in highway engineering — three length criteria, shift formula, tangent distance, setting out methods, and IRC recommendations with solved example.
Learn extra widening of pavement on horizontal curves — mechanical widening due to off-tracking (Wm=nℓ²/2R) and psychological widening (Wps=V/9.5√R) with IRC rules and solved examples.
Complete guide to super elevation (cant/banking) in highway engineering. Formula derivation, IRC maximum values, 4-step design procedure, equilibrium SE, and attainment methods explained.
Master Overtaking Sight Distance (OSD) with step-by-step d1, d2, d3 component derivation, IRC rules for overtaking zones, comparison with SSD, and fully solved numerical examples.
Detailed derivation of Stopping Sight Distance (SSD) formula with PIEV theory, three gradient cases (flat, uphill, downhill), IRC recommendations, and fully solved numerical examples.
Complete guide to all four types of sight distance in highway engineering: SSD, OSD, ISD, and HSD. Covers definitions, eye and object heights, IRC standards, and comparison table.