Horizontal Alignment

ROADWAY DESIGN CALCULATIONS - TOLLWAY MAINLINE

(Based on Illinois Tollway Roadway Design Criteria Manual)

NEW HELP

CONTRACT NAME OR NUMBER

TOLLWAY SYSTEM

DESIGN SECTION ENGINEER

MILEPOST BEGIN

MILEPOST END

STATION FROM

STATION TO

DESIGN VEHICLE

LEVEL OF SERVICE

DIFFERENT VERTICAL ALIGNMENTS IN TWO DIRECTIONS

DOES PROJECT BEGIN-LIMIT FALL ON A TANGENT ?

YES

PRIOR CURVE DATA :

PT STA.

Δ ANGLE DIRECTION

CURVE RADIUS

LANE CONFIGURATION

SE DISTRIBUTION(%)

CURVE

PI STA.

Δ DIR.

R =

PC STA.

PT STA.

SE DISTRIBUTION (%)

LANE CONFIGURATION

WIDTH (HIGH SIDE)

X-SLOPE

WIDTH (LOW SIDE)

X-SLOPE

OUTSIDE SHOULDER (HIGH SIDE)

SHLD. WIDTH

X-SLOPE

OUTSIDE SHOULDER (LOW SIDE)

SHLD. WIDTH

X-SLOPE

SIGHT OBSTRUCTION ALONG LOW SIDE SHLD. DISTANCE TO EOS (LOW SIDE)

DOES PROJECT END-LIMIT FALL ON A TANGENT ?

YES

NEXT CURVE DATA :

PC STA.

Δ ANGLE DIRECTION

CURVE RADIUS

LANE CONFIGURATION

SE DISTRIBUTION(%)

DOES PROJECT BEGIN-LIMIT FALL ON A VERTICAL TANGENT ?

YES

VPT STA. PRIOR TO PROJECT BEGIN LIMIT

CURVE

VPC: STA

ELEV

G1 =

VPI: STA

ELEV

G2 =

VPT: STA

ELEV

ROADWAY LIGHTING IS PRESENT

DOES PROJECT END-LIMIT FALL ON A VERTICAL TANGENT ?

YES

VPC STA. AFTER PROJECT END LIMIT

DOES PROJECT BEGIN-LIMIT FALL ON A VERTICAL TANGENT ?

YES

VPT STA. PRIOR TO PROJECT BEGIN LIMIT

CURVE

VPC: STA

ELEV

G1 =

VPI: STA

ELEV

G2 =

VPT: STA

ELEV

ROADWAY LIGHTING IS PRESENT

DOES PROJECT END-LIMIT FALL ON A VERTICAL TANGENT ?

YES

VPC STA. AFTER PROJECT END LIMIT

RDC 1.6: DESIGN VEHICLE = SELECT

RDC 2.1: LEVEL OF SERVICE = SELECT

RDC 2.2: DESIGN SPEED = 70 mph

Contract	Date Created	Date Modified

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