Difference between revisions of "User:Kartografer/Roundabouts/USA"

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== Understanding navigation instructions ==
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#REDIRECT [[Roundabouts/USA#Understanding_navigation_instructions]]
Normal roundabouts give a ''‘turn right’'' / ''‘continue straight’'' instruction. Non-normal roundabouts give a ''‘take the X exit’'' instruction. This section will explain the difference between a normal and a non-normal roundabout.
 
<br/>
 
A '''normal''' roundabout:
 
*Will give you a ‘turn right', 'turn left’ or ‘continue straight’ instruction.
 
*Has ''up to'' '''4''' nodes.
 
*All exit nodes are aligned within "normal" range of the entrance node.
 
A '''non-normal''' roundabout:
 
*Has '''5''' or more nodes (Ex. Each segment of a [[Best_map_editing_practice#When_.28Not.29_to_Split_a_Two-Way_Road|split]] road connects at its own node.)
 
*Has irregularly placed nodes (this will be covered in the examples.)
 
*Will give you a ‘take the X exit’ (with arrows around it) instruction.
 
''A roundabout can be both normal and non-normal at the same time depending on your entrance node.''<br/>
 
'''Some examples will help explain:'''<br/>
 
*For the sake of simplicity, let’s look at a roundabout with three exits.
 
*The angle of the segment approaching the node does not matter, it can be similar to  any of the segments below, or anywhere in between.<br/>
 
[[Image:Roundabout_2.jpg|360px]][[Image:Roundabout_3.jpg|250px]]
 
<br/>
 
<br/>
 
*Each time you approach a roundabout from one of the three nodes, an imaginary X-Y axis is drawn: ''(1)'' with the origin at the center of the roundabout and ''(2)'' aligned to the entrance node.
 
*'''Coming from node #1, this is how we see the roundabout:'''
 
[[Image:Roundabout_4.jpg|right]]
 
<br/>
 
:*Both exits 2 and 3 are within the normal range (90&deg;&plusmn;15&#176; & 180&deg;&plusmn;15&deg;).
 
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:*''Both exits will get an instruction to ‘turn right’ or ‘continue straight’.''
 
<br clear="all" />
 
*'''Coming from node #3, this is how we see the roundabout:'''
 
[[Image:Roundabout_5.jpg|right]]
 
<br/>
 
:*Both exits 1 and 2 are not within the ‘normal’ range – both will get a ‘take the X exit’.
 
<br/>
 
:*'''''Note:''' even if one of these exits was within normal range, the roundabout itself will be ‘non-normal’ and all exits will get the ‘take the X exit’ prompt. The entire roundabout must be normal.''
 
<br clear="all" />
 

Latest revision as of 20:15, 1 August 2016