Official Site of The State of New Jersey

Governor Phil Murphy • Lt. Governor Tahesha Way

Department of Transportation

Roadway Design

NJDOT provides certain online calculators for use in roadway design. These are made available as standard tools and as a convenience for designers and others involved with road planning and design.

Roadway Design Calculators - U.S. Customary English Units

Design ADA Curb Ramps

In the following calulators L is the length of vertical curve in feet, S is the sight distance in feet. V is speed in mph.

Design control for crest vertical curve when S is greater than L
Design control for crest vertical curve when S is less than L
Design control for sag vertical curve when S is greater than L
Design control for sag vertical curve when S is less than L
Safe speed for horizontal curves when V is greater than 50 mph based on "A Policy on Geometric Design of Highways and Streets", 2001
Safe speed for horizontal curves when V is less than or equal to 50 mph
Design control for radius of horizontal curve with Sight Obstruction

Official Site of The State of New Jersey

Department of Transportation

Roadway Design

Roadway Design Calculators - U.S. Customary English Units

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Last updated date: December 16, 2019 2:33 PM