Quote - Yes it was the one and a big thanks for taking time to locate it.
 Now to clear all my temp files so can save the movie file and have it so can use off link. :)

Thats the tut I was thinking about but after looking at it I am still needing some help.
  How do I add one car and make it populate as many and keep the same distance between each car.  also same distance from side to side. ............?

 

Ecosystem is meant to randomly distribute copies of an object or plant. If you are planning on making a long queue of cars with each having the same direction and distance from each other, then why not just making an array from one car? While holding alt key move the car, you will have moved a copy. now just hit the * (asterisk) key on your num pad (numlock should be turned on), it will ask you for a number, just choose 10 and hit enter key to have a queue of 10 cars all straight up in a line.

For an ecosystem i would recommend the following settings:

Tab Density: Choose "Force regular alignment of instances"
Tab Scaling and orientation: Choose "Maximum rotation to 0", "Maximum size variation to 0"

With the density tab you can control the distance, "Avoid overlapping instances" will not be available. The other settings should be like vue default when you create a new ecosystem from the basic material.

If your road is wide enough to allow 2 cars beneath each other (depends on density setting), it may look very odd, if you want to populate a 2 lane road and not have it looking like a military parade, then split the road in 2 objects placed beneath each other so you cant see its actually 2 objects. Then move one of them so the car queues have a variation, making it look at least a bit more realistic (although having same distance for every instance is already killing the feeling of realism, no variation here).

Vue content creator
www.renderarmy.com