ROADWAY DESIGN CRITERIA Tracy Borchardt February 2013 1

Roadway Design Criteria The Roadway Design Criteria dated October 2012 replaces the version issued August 2002. This was a MAJOR REVISION. This manual will get on the same cycle as the other manuals. It will be issued in March with minor revisions. 2

Roadway Design Criteria Sight Distance Stopping Decision Compound Curve Lengths SE Rates Mainline Ramps K values – Vertical Curves Crest Sag Added references to AASHTO Green Book Article 2.3.1 Stopping Sight Distance Article 2.3.2 Decision Sight Distance Article 2.4.2 Min. Length of Curves – Compound Curves Article 2.4.6 Superelevation Rates Article 2.5.4 Design Controls for Crest Vertical Curves Article 2.5.5 Design Controls for Sag Vertical Curves 3

Roadway Design Criteria Added Definitions: Added definitions for Service and System Interchanges System Interchange Service Interchange 4

Maximum Superelevation For example: Separated System Interchange criteria from Service Interchange. 5

Superelevation Distribution Mainline 85% of SE runoff on Tangent Ramps (all speeds) 80% of SE runoff on Tangent New article. Article 2.4.7 85% of SE runoff on tangent for mainline is NOT new. 80% of SE runoff on tangent for ramps is new. 6

Revised Mainline Typical Section Revised pavement width for new typical section Article 2.6.1 M19 Mainline 3 lanes – 39’ 4 lanes – 51’ 5 lanes – 63’ M20 Ramps, M21 Directional Ramps, 7

Typical Section – Pavement Width Revised based on new typical section. Lane 1 ---- 12’ to 14’ 8

Typical Section – Pavement Cross Slope Revised based on new typical section. Crown moved from LL between L1 and L2 to inside EOP. Lanes 3 and 4 increased to 2% Lane 5 (or any aux. lanes) increases to 2.5% 9

Typical Section – Maximum Rollover Revised based on new typical section. Article 2.4.8 Add maximum rollover between pavement and Preferential lane of 3.5% All other rollover criteria stayed the same. 10

Typical Section – Paved Shoulder Width Revised based on new typical section. Article 2.6.4 When used as preferential lane inside shoulder width increased by 2.5’ 11

Typical Section – Paved Shoulder Cross Slope Revised based on new typical section. Article 2.6.4 Cross slope of inside shoulder decreased from 4% to 2% Outside shoulder decreased from 4% to 3% 12

Minimum Grades Mainline and Ramps:  0.5% minimum 13 Article 2.5.2 Minimum grade revised from 0.3% to 0.5% Article 2.5.2 13

Use of Gutters and Curbs Gutter Type G-2 Gutter Type G-3 New Article. Article 2.6.6 Reference Tollway Standard B1. No portion of the gutter shall be considered part of the rideable area of the shoulder or counted as part of the shoulder width. Gutter Type G-3 and G-2 are not allowed along unshielded embankment slopes steeper than 1:6 (V:H). When gutter is required adjacent to a Traffic Barrier Terminal Type T1 (Special), Gutter Type G-3 Modified shall be used. Another use for Gutter Type G-3 Modified is between the paved shoulder and snow storage areas (see typical sections with retaining walls and noise walls, Reference Section M-Base Sheet Drawings). When gutter is required adjacent to a Traffic Barrier Terminal Type T1-A (Special), Gutter Type G-2 Modified shall be used. Another use for Gutter Type G-2 Modified is between the ramp paved shoulder and snow storage areas (see typical sections with retaining walls and noise walls, Reference Section M-Base Sheet Drawings) and adjacent to an F-shape retaining wall parapet. Type C curb is 9” high and shall only be used along toll plaza parking areas, at maintenance facilities, or in conjunction with guardrail on the tapering approach to a toll plaza. Type C curb shall not be used along the mainline. Type C Curb 14

Use of Gutters and Curbs – G-3 Gutter Table is from page 12 in RDC 15

Use of Gutters and Curbs – G-2 Gutter Table is from page 13 in RDC 16

Use of Gutters and Curbs – G-3 Modified Gutter Another use for Gutter Type G-3 Modified is between the paved shoulder and snow storage areas (see typical sections with retaining walls and noise walls, Reference Section M-Base Sheet Drawings). 17

Use of Gutters and Curbs – G-3 Modified Gutter Another use for Gutter Type G-3 Modified is adjacent to Traffic Barrier Terminal Type T1 18

Snow Storage – Single Slope Parapet New Article Single slope barrier shown --- not clear why snow storage was necessary here 19

Snow Storage – Single Slope Parapet Here is an example with many things wrong. Single slope wall not necessary with moment slab. Guardrail in front of a crash-worthy parapet. Guardrail posts in concrete. 20

Snow Storage – F-Shape Parapet Here is an example of an F-shape parapet with a moment slab. Again, it is not clear why snow storage is provided here. F-shape parapet should be used when a moment slab is needed. 21

Snow Storage – Transitions Transitions in and out of the snow storage areas have been a problem. Triangular area needs to be paved and gutter type needs to be “modified”. 22

Sideslopes 23 Revised Article. Article 2.6.7 Typical section shows the information better than the table of values does. In general the barn roof cross section works best 23

Emergency Turnarounds Clearance Opening 25’-30’ New Article. Article 2.6.11 Emergency turnarounds shall be located at a site that allows a minimum of 1000‘ clear stopping sight distance in both directions. The location selected shall be acceptable to the Tollway’s Maintenance staff and the Illinois State Police, District 15. A clearance opening between 25’-30’ shall be provided between the impact attenuators placed at each end of the opening in the median barrier wall to allow for emergency vehicles to maneuver. These are not called cross-overs 24

Shoulder Widths (New Structures) Revised Article. Article 2.7.1 Mainline: Left side shoulder increased from 10’ to 12’ Ramp: Two lane pavement shoulder increase from 10’ to 12’ 25

Vertical Clearances 26 Article 2.7.3 Deleted values added reference to Tollway Structure Design Manual 26

Toll Plazas All Electronic Tolling (AET) Mainline AET Ramp AET 27 Article 2.8 Revised Article to include All Electronic Tolling Mainline - Open Road Tolling (ORT)/All Electronic Tolling (AET) Zones Ramp - Open Road Tolling/All Electronic Tolling Zones Ramp AET 27

Permanent Right of Way 28 Article 2.14.2 Revised values for condition when foreslope is steeper than 1:3 and fill ht. is greater than 9’ Reference Base Sheet M23 28

Questions ? E-Mail: tborchardt@getipass.com 29