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=== U-Turn Constructions ===
o  1.1 Dedicated U-Turn Lane Construction
[[File:Thai U-Turn.jpg|thumbnail|right|Concept: dedicated u-turn lanes on a divided road.]]The following guidance applies only to dedicated U-Turn lanes that allow traffic to turn around to access addresses on the opposite side of a divided road.


* Concept: use a segment of the same road type as the connecting type, without city and street name, connected with a small departure angle of 170 degrees or higher, to trigger the "make a u-turn" instruction, coming from both directions. Notes:
o  1.2  Short U-Turn Construction
<small>1- U-turn Segment length has to be 16 m or longer.


2- Segment start to prevent recalculation of route.
o  1.3 Dedicated U-Turn Lane Construction with Side street Connection


3- The U-turn segment needs to be of the same grade as the road it is on.
===U-Turn Constructions===


4- After construction set the Lock Level to the road classification, or minimum L3.</small>
'''<big>1.1 Dedicated U-Turn Lane Construction</big>'''
[[ไฟล์:Extended U-Turn.jpg|thumb|842x842px|Concept: dedicated U-Turn lanes on a divided road.|none]]
[[ไฟล์:Extended U-Turn TIO.jpg|thumb|842x842px|none]]
The following guidance applies only to dedicated U-Turn lanes that allow traffic to turn around to access addresses on the opposite side of a divided road.


Concept: use a segment of the same road type as the connecting type, streetname “U-Turn” with cityname (when known), connected with a small departure angle of 22 - 44 degrees to trigger the "keep right to U-Turn" instruction then connected to the opposite side at a 90-degree angle.


{{mbox
Click here for a live example of an “Dedicated U-Turn Lane”: https://www.waze.com/editor?env=row&lon=100.67416&lat=13.71956&zoom=8<blockquote>''Notes:''</blockquote><blockquote>''1- U-Turn departure segment should start just before the beginning of the solid white line (point of no return) for the dedicated U-Turn lane.''</blockquote><blockquote>''2- The 90 degree connected segment should have a TIO to indicate “U-Turn” instead of the standard “turn right” instruction.''</blockquote><blockquote>''3- The U-Turn segment needs to be of the same elevation as the road it is on.''</blockquote><blockquote>''4- After construction set the Lock Level to the same level as the road classification, or minimum L3.''</blockquote>{{mbox
| type = important
| type = important
| text = To ensure proper construction and angles, it is essential that you have the [[Scripts/WME_Junction_Angle_info|Junction Angle Info tool]] installed before attempting to create a U-turn construction.   
| text = To ensure proper construction and angles, it is essential that you have the [[Scripts/WME_Junction_Angle_info|Junction Angle Info tool]] installed before attempting to create a U-turn construction.   
}}
}}


<br /><br />
<br /><big>'''1.2 Short U-Turn Construction'''</big>


There are 2 variations possible: a small and a large version. The difference lies in the instructions received by the driver.  
This construction is used where there is no dedicated U-Turn lane to connect a divided road yet U-Turns are allowed.   A segment should be added to connect the two divided roads at 90 degree angles with the total length of the U-Turn segment at least 16 meters to ensure proper navigation. The segment should be the same type as the main roads that it is connected to and should be named “U-Turn” (unless it is also connected to a side road for right turns, in which case the segment will not be named but will include the city and state, if known).  The U-Turn segment should be locked at the same level as the road it connects, or at least L3.


====Small U-turn construction====
Click here for a live example of a “Short U-Turn”: https://www.waze.com/editor?env=row&lon=100.59452&lat=13.67556&zoom=9&segments=370704089[[ไฟล์:Short U-Turn.jpg|thumb|463x463px|none]]A TIO for “keep right” should be placed on the first turn to the U-Turn and a TIO for “u-turn” should be placed on the last turn.  This will provide the drivers with the same navigation commands as an extended U-Turn and will help ensure they are in the right-most lane in advance of the U-Turn.  For example, the TTS instructions heard by the driver will be “in 300 meters keep right to U-Turn, then U-Turn”.[[ไฟล์:Short U-Turn TIO 1.jpg|thumb|402x402px|none]][[ไฟล์:Short U-Turn TIO 2.jpg|thumb|402x402px|none]]


This construction is used where the total length of the construction is less than 150 meters (measured from the startpoints of the U-turn lanes). This type of U-turn will give the driver a "make a U-turn" instruction. This type is typically found on {{Primary Street|Primary Streets}} , Rural Roads and {{Minor Highway|minor Highways}}.
'''<big>1.3 Dedicated U-Turn Lane Construction with side road</big>'''


[[File:Small_uturn.png|700px]]
This construction is the same as a normal “Dedicated U-Turn Lane” construction, except the segment remains unnamed, except for the city and state (if known).
[[ไฟล์:Dedicated U-Turn with Side Rd.jpg|thumb|834x834px|none]]
A TIO for “u-turn” should be added for the turn connected to the opposite side.
[[ไฟล์:Dedicated U-Turn with Side Rd TIO 1.jpg|thumb|734x734px|none]]


This variation BEGINS with the >170° angle:
A TIO for “turn right” should be added to the connected side road.
[[File:Small_uturn_start.png|200px]]
[[ไฟล์:Dedicated U-Turn with Side Rd TIO 2.jpg|thumb|770x770px|none]]


Find a live example here: [https://www.waze.com/editor/?env=row&lon=103.30510&lat=16.16365&layers=1445&zoom=8 Permalink]
The segment connecting the side road to the opposite side of the divided road, in most cases should be a one-way segment and should be the same road type as the side road and locked at the same level. 


 
Click here for a live example of a “Dedicated U-Turn Lane Construction with side road”: https://www.waze.com/editor?env=row&lon=101.15109&lat=14.22113&zoom=8
====Large U-turn construction====
 
This construction typically measures more than 250 meters, and the U-turn lanes are more than 100 meters long. By reversing the U-turn segment compared to the above version, the driver will first receive a "Keep Right" instruction, followed by a "make a U-Turn" instruction. This type can be found on all types of roads, but most likely on {{Freeway|Freeways}} and {{Major Highway|Major Highways}}.
 
[[File:Large_uturn.png|700px]]
 
This variation BEGINS with the small departure angle (<10°) followed by the >170° angle:
[[File:Large_turn_start.png|300px]] [[File:Large_turn_finish.png|300px]]
 
 
Make sure the u-turn segment has No Name, and the main road DOES have a name. This way traffic that continues on the road will not get an unwanted "keep left". Main route must be according to the [[Best_continuation#Best_Continuation|Best Continuation principle]].
<br />
 
Find a live example here: [https://www.waze.com/editor/?env=row&lon=103.24714&lat=16.13735&layers=1445&zoom=8 Permalink]
 
====Extended U-turn construction====
 
For areas where very long U-turn lanes are used (>200meter) and more advance notification is needed for drivers, there is a 3rd construction available. '''This construction should only be used on {{Freeway|Freeways}}, and in cases where it is proven by receiving [[UR|UR's]] that a regular large U-turn construction is not providing sufficient notice.'''
 
 
[[File:Extended_uturn1.png|340px]]
[[File:Extended_uturn2.png|360px]]
 
Note: both the U-turn and the right turn onto "Test Rd" should go via the u-turn lane, so set the turn restrictions accordingly (as per images above)
 
 
 
====U-Turn / side street combinations====
 
 
 
 
If there are also side streets connected to the U-Turn area, a special construction is needed to provide correct routing instructions for all situations.
The starting situation will look like this:
 
[[File:Start_condition.png|400px]]
 
In order for the construction to work, it must meet the following criteria:
 
- the divided road segments (N-S direction) must be within 5° of parallel to each other
 
- the direct distance between the 2 nodes (A and A) must be 14 meters or less.
 
[[File:Nodes.png|400px]]
 
First create the (2-way) segment used for left/right turns. Note the length of the segment.
 
[[File:Left-right_segment.png|400px]]
 
Now it is time to create the U-turn segment (2-way as well).
 
[[File:Uturn_segment.png|400px]]
 
When saving, you will get an error message saying "There might be something wrong with this edit. Intersecting segments with the same elevation". Ignore this message and save.
 
Once saved, there will be an error showing for the left/right turn segment: "Same endpoints drivable segments (slow)". In order to remove this, 'break' the u-turn segment. Do NOT break the left/right turn segment.
 
With both segments in place, it is time to set/verify the turn restrictions. Basic concept: the U-turn segment should only be used coming from the North or South, and when leaving the U-turn segment it should only be in South or North direction. Any other turn should be routed through the left/right turn segment.
 
[[File:Uturn_with_connectors.gif]]
 
<small>(Technical background: while in theory the routing engine could use either the uturn segment or the left/right segment to make the U-Turn, it is the parameters of the construction that prohibit this: <14meter, and N/S segments parallel. For further explanation see [[Uturn_prevention#Avoiding_U-turns_in_box_and_partial_box_intersections|Avoiding U-turns]])</small>
 
This construction is used for small and large U-turn constructions, NOT for the extended U-turn.
<br />
<br />

รุ่นแก้ไขปัจจุบันเมื่อ 16:46, 29 ธันวาคม 2564

o  1.1 Dedicated U-Turn Lane Construction

o  1.2  Short U-Turn Construction

o  1.3 Dedicated U-Turn Lane Construction with Side street Connection

U-Turn Constructions

1.1 Dedicated U-Turn Lane Construction

Concept: dedicated U-Turn lanes on a divided road.

The following guidance applies only to dedicated U-Turn lanes that allow traffic to turn around to access addresses on the opposite side of a divided road.

Concept: use a segment of the same road type as the connecting type, streetname “U-Turn” with cityname (when known), connected with a small departure angle of 22 - 44 degrees to trigger the "keep right to U-Turn" instruction then connected to the opposite side at a 90-degree angle.

Click here for a live example of an “Dedicated U-Turn Lane”: https://www.waze.com/editor?env=row&lon=100.67416&lat=13.71956&zoom=8

Notes:

1- U-Turn departure segment should start just before the beginning of the solid white line (point of no return) for the dedicated U-Turn lane.

2- The 90 degree connected segment should have a TIO to indicate “U-Turn” instead of the standard “turn right” instruction.

3- The U-Turn segment needs to be of the same elevation as the road it is on.

4- After construction set the Lock Level to the same level as the road classification, or minimum L3.

 To ensure proper construction and angles, it is essential that you have the Junction Angle Info tool installed before attempting to create a U-turn construction.


1.2 Short U-Turn Construction

This construction is used where there is no dedicated U-Turn lane to connect a divided road yet U-Turns are allowed.   A segment should be added to connect the two divided roads at 90 degree angles with the total length of the U-Turn segment at least 16 meters to ensure proper navigation. The segment should be the same type as the main roads that it is connected to and should be named “U-Turn” (unless it is also connected to a side road for right turns, in which case the segment will not be named but will include the city and state, if known).  The U-Turn segment should be locked at the same level as the road it connects, or at least L3.

Click here for a live example of a “Short U-Turn”: https://www.waze.com/editor?env=row&lon=100.59452&lat=13.67556&zoom=9&segments=370704089

A TIO for “keep right” should be placed on the first turn to the U-Turn and a TIO for “u-turn” should be placed on the last turn.  This will provide the drivers with the same navigation commands as an extended U-Turn and will help ensure they are in the right-most lane in advance of the U-Turn.  For example, the TTS instructions heard by the driver will be “in 300 meters keep right to U-Turn, then U-Turn”.

1.3 Dedicated U-Turn Lane Construction with side road

This construction is the same as a normal “Dedicated U-Turn Lane” construction, except the segment remains unnamed, except for the city and state (if known).

A TIO for “u-turn” should be added for the turn connected to the opposite side.

A TIO for “turn right” should be added to the connected side road.

The segment connecting the side road to the opposite side of the divided road, in most cases should be a one-way segment and should be the same road type as the side road and locked at the same level. 

Click here for a live example of a “Dedicated U-Turn Lane Construction with side road”: https://www.waze.com/editor?env=row&lon=101.15109&lat=14.22113&zoom=8

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