Design of Horizontal Curves

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Superelevation Practical upper limits – 6% (NDDOT) • Climate ○ Water ○ Ice • Terrain conditions ○ Flat ○ Mountainous • Adjacent land use (rural or urban) • Frequency of slow moving vehicles ○ Tractors, Etc.
Methods of Distribution of Superelevation and Side Friction 5 methods • Methods #2 and #5 are the most common Method #2: Side friction is such that a vehicle has all lateral acceleration sustained by side friction. Superelevation is used once f is equal to f_max. Method #5: Side friction and superelevation are in a curvilinear relation with the inverse of the radius of the curve.
Page 1 and 2: Paul Deutsch NDDOT Office of Projec
Page 3 and 4: Why are Horizontal Curves Needed N
Page 5 and 6: Guidelines to Horizontal Curves A
Page 7 and 8: Parameters Design of roadway curve
Page 12 and 13: Methods of Distribution of Superele
Page 14 and 15: Finding Minimum Radius Minimum Rad
Page 16 and 17: Methods of Attaining Superelevation
Page 18 and 19: Superelevation Transitions Consist
Page 20 and 21: Runoff For appearance and comfort,
Page 22 and 23: Runoff NDDOT uses a Desired Relati
Page 24 and 25: Runout
Page 26 and 27: Equation for minimum length of supe
Page 28 and 29: Spiral Curves Simple Curve Spiral T
Page 30: Superelevation Tables Incorporatin
Page 34 and 35: Main Points Considerations for Hor
Page 36: Sources ○ A Policy on Geometric D

Design of Horizontal Curves

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