CEE 320. Fall Horizontal Alignment
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1 Horizontal Alignment
2 Horizontal Alignment Objective: Geometry of directional transition to ensure: Safety Comfort Primary challenge Transition between two directions Fundamentals Circular curves Superelevation or banking Δ
3 Vehicle Cornering F c Centripetal force parallel to the roadway W Side frictional force Weight parallel to the roadway W p F f F cp
4 Vehicle Cornering W p F f F cp v F c W α W sin f s W cos WV g v 2 sin WV g v 2 cos
5 Horizontal Curve Fundamentals PI PC L PT Curve is a circle, not a parabola
6 Superelevation Banking number of vertical feet of rise per 100 ft of horizontal distance e = 100tan α
7 Superelevation W sin f s W cos WV g v 2 sin WV g v 2 cos Divide both sides by Wcos(α) tan e 100 f v f s s 2 V g v 1 f 2 V 1 f gv 2 V e g fs 100 s s tan e 100
8 Superelevation Minimum radius that provides for safe vehicle operation Given vehicle speed, coefficient of side friction, gravity, and superelevation v because it is to the vehicle s path (as opposed to edge of roadway) v g f s V 2 e 100
9 Selection of e and f s Practical limits on superelevation (e) Climate Constructability Adjacent land use Side friction factor (f s ) variations Vehicle speed Pavement texture Tire condition Maximum side friction factor is the point at which tires begin to skid. Design values are chosen below maximum.
10 Minimum adius Tables
11 from the 2005 WSDOT Design Manual, M WSDOT Design Side Friction Factors For Open Highways and amps
12 Design Superelevation ates - AASHTO from AASHTO s A Policy on Geometric Design of Highways and Streets 2004
13 Design Superelevation ates - WSDOT e max = 8% from the 2005 WSDOT Design Manual, M 22-01
14 Example A section of S 522 is being designed as a high-speed divided highway. The design speed is 70 mph. Using WSDOT standards, what is the minimum curve radius (as measured to the traveled vehicle path) for safe vehicle operation?
15 Horizontal Curve Fundamentals Degree of curvature: Angle subtended by a 100 foot arc along the horizontal curve A function of circle radius Larger D with smaller Expressed in degrees PC T L PI E M Δ Δ/2 PT D ,000 Δ/2 Δ/2
16 Horizontal Curve Fundamentals Tangent length (ft) T tan 2 PC T L PI E M Δ Δ/2 PT Length of curve (ft) L D Δ/2 Δ/2
17 Horizontal Curve Fundamentals External distance (ft) E 1 cos 2 1 PC T L PI E M Δ Δ/2 PT Middle ordinate (ft) Δ/2 Δ/2 M 1 cos 2
18 Example A horizontal curve is designed with a 1500 ft. radius. The tangent length is 400 ft. and the PT station is What is the PC station?
19 Stopping Sight Distance Looking around a curve Measured along horizontal curve from the center of the traveled lane Need to clear back to M s (the middle of a line that has same arc length as SSD) SSD D Assumes curve exceeds required SSD v s s SSD (not L) Obstruction Δ s M s v
20 Stopping Sight Distance SSD (not L) s 180 SSD v M s M s v 1 cos 90SSD v Obstruction v SSD v 90 cos 1 v M v s Δ s
21 Example A horizontal curve with a radius to the vehicle s path of 2000 ft and a 60 mph design speed. Determine the distance that must be cleared from the inside edge of the inside lane to provide sufficient stopping sight distance.
22 Superelevation Transition from the 2001 Caltrans Highway Design Manual
23 Spiral Curves No Spiral Spiral from AASHTO s A Policy on Geometric Design of Highways and Streets 2004
24 Spiral Curves Ease driver into the curve Think of how the steering wheel works, it s a change from zero angle to the angle of the turn in a finite amount of time This can result in lane wander Often make lanes bigger in turns to accommodate for this
25 No Spiral
26 Spiral Curves WSDOT no longer uses spiral curves Involve complex geometry equire more surveying If used, superelevation transition should occur entirely within spiral
27 Operating vs. Design Speed 85 th Percentile Speed vs. Inferred Design Speed for 138 ural Two-Lane Highway Horizontal Curves 85 th Percentile Speed vs. Inferred Design Speed for ural Two-Lane Highway Limited Sight Distance Crest Vertical Curves
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