title: Netlogo - making a row of turtles stop when the first one comes to a halt
body: <p>I'm new to NetLogo, so I apologise if this is a dumb question.</p>
  
  <p>I have a row of turtles representing people walking in single file along a path. Occasionally one of the turtles will pause. I need all the turtles immediately behind the turtle to stop at the same time so they don't pile up on one another. Is there is a simple way of doing this?</p>
  
  <p>So...</p>
  
  <p>ooooo - line of people walking along</p>
  
  <p>xxxxx - first one stops</p>
  
  <p>and</p>
  
  <p>ooooo - another line of people walking along</p>
  
  <p>xxx oo - middle one stops, everyone behind him stops, people in front keep walking</p>
  
  <p>and</p>
  
  <p>ooo  oo - line of people walking along with a gap between them</p>
  
  <p>ooo xx - front of line stops, people behind keep walking</p>
  
  <p>Many thanks for any help you can give.</p>
  
  <p>Mike.</p>