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Tools
Roadway Design
Crest Vertical Curve S > L
Crest Vertical Curve S < L
Sag Vertical Curve S > L
Sag Vertical Curve S < L
Safe Speed Horizontal
   Curve V > 50 mph
Safe Speed Horizontal
   Curve V < 50 mph
Radius of Horizontal
   Curve w/ Sight
   Obstruction
Hydrology

Tools

(Supported by NJDOT Standards and Guidance Documents)


Roadway Design Tool

Design Control for Crest Vertical Curve
When S is Greater Than L


U.S. Customary English Units

This program calculates sight distance on a crest vertical curve when the sight distance is greater than the length of curve. Using the calculated sight distance, find Vcalc in the table below.

S = (L/2)+(1079/A)

Enter L and A


L = Length of Vertical Curve (ft.)

A = Algebraic Difference in Grade


 

Sight Distance (ft.)
S feet 152 160 169 178 187 197 206 216 226 236 246 257 269 278 289 301
Vcalc mph 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

 
S feet 312 324 336 348 360 372 385 398 411 424 437 451 464 478 498 507
Vcalc mph 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

 
S feet 521 536 551 566 581 597 613 628 644 661 667 694 711 728

Vcalc mph 57 58 59 60 61 62 63 64 65 66 67 68 69 70

 
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  Last Updated:  April 13, 2005