150m is too far away to start using LODs.
The screenshot shows brake hoses and jumpers at the ends and these poly eaters will not be seen more than 10m away.
This is a useful route to test LODs.
http://www.elvastower.com/file_library/ ... 8a6d0298ae
It's only a small download.
Just check the distance away on the route and LOD the parts out as they become less than a pixel on the screen.
Another trick is to use LODs to stop things appearing UNTIL a certain distance.
My wagon wheels are fully modeled (and high poly) close up but at 100m they dissapeared and are replaced by a five sided tube with the top poly deleted and alpha'd flats for the faces.
These low poly wheels are not animated saving processor work.
At 100m or even less, all you see is a dark blob anyway and the wheels are always high in polys so are well worth getting rid of as soon as possible.
You can do the same with any other tubular parts, replacing them with tubes with less sides or crosses.
You should definately use LODs as much as possible.
