OK, I've fixed that in trunk.

> Date: Fri, 27 Sep 2013 08:07:50 +0100
> From: steve@parabola.me.uk
> To: mkgmap-dev@lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] highway count not fixed yet... - merge-roads-branch
>
> On 27/09/13 08:04, Gerd Petermann wrote:
> > @Steve: I think this is not intended and should be changed so that the
> > default value 5.0 is used in this case as well?
>
> Yes, it should have the default value when no argument is given.
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