It is no longer a viable route given today's traffic situations.

I think you are a long way short of showing that it's necessary - easier, possibly, but there are certainly other viable routes.

The road led up to a hole in this hedge, and there seemed to be no viable alternate routes.

Soon I had a drawn a viable route around Europe.

Not only can you get paid, but running is a viable route to education, global travel and a good living.

That study is expected to select the most viable route.

Furthermore, I am sure that you will find a viable route in the direction indicated.

It will then transpire that the Community method is the only viable route to take.

Reds were at the corners with one out, but Young had a viable route of escape left.

Only outside of the channel can points be found, which can lead to destination via a viable route.