[Talk-GB] Girl of four died in turn-restriction error

Ed Avis eda at waniasset.com
Fri Feb 4 13:48:17 GMT 2011


The lack of good turn-restriction information can be lethal.  (Of course, this
news story proves that people should keep looking at the road signs even when
using sat-nav.  It also proves that sometimes they do not.)

Perhaps we need an explicit tagging for 'no turn restriction' at junctions.
Data checking can then produce a warning for major road intersections where the
turn-restriction info is missing.  To keep the report manageable, it would have
to be restricted to junctions where one of the roads is highway=primary or
secondary.  That's still a lot of checking to do.

I have sometimes wondered whether harvesting GPS traces would help with this
task.  If every trace shows turning left at the junction, flag a warning for
somebody to check whether a turn restriction needs to be added.  But to do that
we would need a bigger collection of traces, appropriately tagged to show which
are from motor vehicles.

Ed Avis <eda at waniasset.com>

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