User:TheLastTaterTot/Roundabout Navigation Instructions View history

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== Understanding navigation instructions ==
#REDIRECT [[User:TheLastTaterTot/Roundabout navigation instructions]]
This section will answer 2 main questions:
*What is a normal '''''vs.''''' a  non-normal roundabout?
*When will I get a ''‘turn right’'' / ''‘continue straight’'' instruction '''''vs.''''' a ''‘take the X exit’'' instruction?
<br/>
A '''non-normal''' roundabout:
*Will give you a ‘take the X exit’ (with arrows around it) instruction.
*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.)
A '''normal''' roundabout:
*Will give you a ‘turn right', 'turn left’ or ‘continue straight’ instruction.
*Has ''up to'' '''4''' nodes, and a central node.
*All nodes are aligned within "normal" range of the entry point.
''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 central node 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;).
<br/>
:*''Both exits will get an instruction to ‘turn right’ or ‘continue straight’.''
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*'''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.''
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Latest revision as of 05:44, 2 December 2015

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