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== Overview ==
|align="center" | Under consideration for state page - Not official guidance
''The goal of this page update is to incorporate guidance relevant to mapping Left turns and U-Turns into the Illinois wiki page.''
{| class="wikitable" style="width:100%; text-align:center; color:red; font-weight:bold"
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| This information is under consideration for the Illinois state wiki.<br>It should not be considered official guidance.
|}
|}
=== U-Turns ===
In Illinois, U-Turns can be performed unless specifically prohibited by law. Illinois statue defining the limitations on U-Turns is [http://www.ilga.gov/legislation/ilcs/ilcs4.asp?DocName=062500050HCh%2E+11+Art%2E+VIII&ActID=1815&ChapterID=49&SeqStart=121100000&SeqEnd=121800000 625 ILCS 5/11-802] and can be reviewed in the Illinois Secretary of State [http://www.cyberdriveillinois.com/publications/pdf_publications/dsd_a112.pdf Rules of Road] booklet.


When considering enabling a U-Turn on the Waze map in Illinois, do so only if there is a strong potential to provide improved routing and the movement is not prohibited by law. Some possible situations where this could be the case are:
== Content ==
* Residences or business driveways or parking lots are connected to a divided primary street (PS/mH/MH), where doing so would eliminate complex routing to reach the other side of the road.
=== Turning Restrictions ===
* At the ends of a single segment at a corner gas station (or similar corner parking lot road usage) to allow add-a-stop or new destination selections to provide an optimal exit route.
The provisions for turning in Illinois are defined in Rules of the Road, in Illinois Compiled Statutes [http://ilga.gov/legislation/ilcs/ilcs4.asp?DocName=062500050HCh%2E+11&ActID=1815&ChapterID=49&SeqStart=109900000&SeqEnd=134500000 625 ILCS 5/11]. In this wiki section we cover two specific situations: Left turns across medians and U-Turns.


Do not enable U-Turns at every intersection on streets or primary streets (PS/mH/MH) even if allowed by law as this may also lead to routes that are challenging to execute.
==== Left Turns across Medians ====
Left turns across paved non-curbed medians are allowed in Illinois, defined in [http://ilga.gov/legislation/ilcs/ilcs4.asp?DocName=062500050HCh%2E+11+Art%2E+VII&ActID=1815&ChapterID=49&SeqStart=119600000&SeqEnd=121100000 625 ILCS 5/11-708 (e)].


Before enabling a U-Turn, be sure it is allowable by law. In summary, the conditions that must be met are:
The Illinois Department of Transportation (IDOT) defines several types of medians in Bureau of Design and Environment Manual Ch. 34, [http://www.idot.illinois.gov/assets/uploads/files/doing-business/manuals-split/design-and-environment/bde-manual/chapter%2034%20cross%20section%20elements.pdf Cross Section Elements]:
* Flush - A median which is adjacent to traffic lanes and on the same plane as the lanes. These are painted on the pavement surface.
* Depressed - The median between opposing traffic lines is slightly below the elevation of the traffic lanes. It is also designed for drainage and storage of plowed snow.
* Raised-Curb - The curb on these medians is greater than two inches in height.
* Traversable - This type of median has a curb two inches in height.
 
A Two-Way Left Turn Lane (TWLTL) is typically a flush median. IDOT allows a traversable median to be used as a TWLTL in place of a flush median.
 
==== U-Turns ====
In Illinois, U-Turns can be performed unless specifically prohibited by law. Illinois statute defining the limitations on U-Turns is [http://www.ilga.gov/legislation/ilcs/ilcs4.asp?DocName=062500050HCh%2E+11+Art%2E+VIII&ActID=1815&ChapterID=49&SeqStart=121100000&SeqEnd=121800000 625 ILCS 5/11-802] and can be reviewed in the Illinois Secretary of State [http://www.cyberdriveillinois.com/publications/pdf_publications/dsd_a112.pdf Rules of Road] booklet.
 
U-Turns can be enabled when editing by enabling the U-Turn flag or at box (#) and partial-box (H) intersections when the median segment is more than 15m in length (See [[Junction_Style_Guide/Intersections#Avoiding_U-turns_in_box_and_partial_box_intersections|Avoiding U-turns in box and partial box intersections]]).
 
When considering enabling a U-Turn, do so only if there is a strong potential to provide improved routing. Some examples of U-Turn implementations are:
* Where driveways or parking lots are connected to a median-divided roadway and doing so would eliminate complex routing to reach the proper side of the road.
* At both connected end-points of a single segment parking lot or gas station to provide an optimal exit route.
 
Before enabling a U-Turn on public streets, these conditions should be met:
* No traffic control devices posted prohibiting the movement.
* No traffic control devices posted prohibiting the movement.
* The movement may not be performed on a curve.
* The movement may not be performed on a curve.
* The movement may not be perfomed on a hill or incline.
* The movement may not be performed on a hill or incline.
* A driver must be able to see in all directions on all roadways a at least 500 feet (152.4 meters).
* A driver must be able to see in all directions on all roadways a at least 500 feet (153 meters).
* The turn must be able to be completed as a single continuous movement. While not a legal requirement, is best practice for safer navigation.
* At least 15 meters (49 feet) exist from the left edge of the legal departure lane to the right edge of the destination lane, including any median to the left of the departure lane, to allow single continuous movement.
 
== Discussion ==
This proposal is under discussion on the forums, at the following link: https://www.waze.com/forum/viewtopic.php?f=253&t=171500

Latest revision as of 23:31, 3 January 2016

Overview

The goal of this page update is to incorporate guidance relevant to mapping Left turns and U-Turns into the Illinois wiki page.

This information is under consideration for the Illinois state wiki.
It should not be considered official guidance.

Content

Turning Restrictions

The provisions for turning in Illinois are defined in Rules of the Road, in Illinois Compiled Statutes 625 ILCS 5/11. In this wiki section we cover two specific situations: Left turns across medians and U-Turns.

Left Turns across Medians

Left turns across paved non-curbed medians are allowed in Illinois, defined in 625 ILCS 5/11-708 (e).

The Illinois Department of Transportation (IDOT) defines several types of medians in Bureau of Design and Environment Manual Ch. 34, Cross Section Elements:

  • Flush - A median which is adjacent to traffic lanes and on the same plane as the lanes. These are painted on the pavement surface.
  • Depressed - The median between opposing traffic lines is slightly below the elevation of the traffic lanes. It is also designed for drainage and storage of plowed snow.
  • Raised-Curb - The curb on these medians is greater than two inches in height.
  • Traversable - This type of median has a curb two inches in height.

A Two-Way Left Turn Lane (TWLTL) is typically a flush median. IDOT allows a traversable median to be used as a TWLTL in place of a flush median.

U-Turns

In Illinois, U-Turns can be performed unless specifically prohibited by law. Illinois statute defining the limitations on U-Turns is 625 ILCS 5/11-802 and can be reviewed in the Illinois Secretary of State Rules of Road booklet.

U-Turns can be enabled when editing by enabling the U-Turn flag or at box (#) and partial-box (H) intersections when the median segment is more than 15m in length (See Avoiding U-turns in box and partial box intersections).

When considering enabling a U-Turn, do so only if there is a strong potential to provide improved routing. Some examples of U-Turn implementations are:

  • Where driveways or parking lots are connected to a median-divided roadway and doing so would eliminate complex routing to reach the proper side of the road.
  • At both connected end-points of a single segment parking lot or gas station to provide an optimal exit route.

Before enabling a U-Turn on public streets, these conditions should be met:

  • No traffic control devices posted prohibiting the movement.
  • The movement may not be performed on a curve.
  • The movement may not be performed on a hill or incline.
  • A driver must be able to see in all directions on all roadways a at least 500 feet (153 meters).
  • The turn must be able to be completed as a single continuous movement. While not a legal requirement, is best practice for safer navigation.
  • At least 15 meters (49 feet) exist from the left edge of the legal departure lane to the right edge of the destination lane, including any median to the left of the departure lane, to allow single continuous movement.

Discussion

This proposal is under discussion on the forums, at the following link: https://www.waze.com/forum/viewtopic.php?f=253&t=171500