in the united states the hole thing starts out as gravel , 

  
>Saturday, July 18, 2020 3:44 PM -05:00 from Mike Thompson 
><miketh...@gmail.com>:
> 
>   
>On Sat, Jul 18, 2020 at 2:23 PM Mark Wagner < mark+...@carnildo.com > wrote:
>  
>>* Two adjacent sections of track being tagged as "grade 2" and "grade
>>  4" not because of any difference in road surface, but because one has
>>  a line of grass between the ruts and the other doesn't.
>In rural areas where I have spent time people often only put gravel where the 
>wheels contract the ground, and leave the middle part of the road/track as is 
>(which is often grass/short native vegetation).  This is done to save money. 
>The result is that from overhead imagery, it may appear not to be gravel, and 
>thus may be incorrectly tagged at a lower tracktype.
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