Nav mesh estimated tile count 3000 maximum limit of 1024 Problem

Hi all,
I am making a game where charectar goes on fixed path .so i used nav mesh agent concept.
if i bake for small length road if work fine but if i increses length of road it gives error message
Nav mesh estimated tile count 3000 maximum limit of 1024…
So is there any way to solve this problem.
Hoping i get something better way for this issue.
Thanks in Advance.

In the Bake options of Navigation set the Radius to a higher number …

http://docs.unity3d.com/Documentation/Manual/Navmeshbaking.html

You may increase Radius in Bake options, but often bake results with big radius are not acceptable.
In this case you may remove “Navigation Static” checkmark in Navigation->Object from some big meshes that are not parts of your character walk path. For example remove fields/forest/street or other decoration meshes around your walkable road from navigation static. This will free a lot of navigation mesh tiles for your character’s playable area