Explain the Reserved Routes in FuelPHP Framework?

There are four reserved routes-

• _403_-This route is followed at the time of uncaught HttpNoAccessException.
• _root_-It is the default route to be followed due to the unspecified URI.
• _404_-At the time of HttpNotFoundException, this route is followed.
• _500_- Uncaught HttpServerErrorException leads to following this route.