Is a hyphen needed after "5km"?

tamguatlay The 5km (-)10-lanehighway will ease traffic congestion.

The 5km of the 10-lane highway will ease traffic congestion.

Is this what you mean?

A 5 km stretch of the highway with ten lanes will ease traffic congestion.

I suppose you mean that 5 km of the highway will be widened to 10 lanes and that will ease congestion.

Thanks, Anon and AStars.

The highway is a new one,

The original sentence is "The 5km 10-lane highway will ease traffic congestion.

I wonder if a hyphen is needed after "5km".

Thanks.

If you spelled 'km' out in full, you would have:

The 5-kilometer 10-lane highway will ease traffic congestion.

Does that help you decide where hyphens should be placed?

ozzourtiIf you spelled 'km' out in full, you would have:The 5-kilometer 10-lane highway will ease traffic congestion.Does that help you decide where hyphens should be placed?

Thanks, ozzourti.

The 5-kilometer 10-lane highway..

That means no hyphen between "kilometre" amd "10", which is my question.