Google maps on my phone has current traffic conditions. When I was in a Traffic jam on the A3 due to a hold up on the M25 I just asked the phone for directions to my home postcode and promptly got a good route down the next country lane.

Postcodes are risky for business locations. A company that I worked at had a PO box with a dedicated postcode which resolved to the delivery office location. That caught out several visitors.

I have noticed several events in rural locations giving a "satnav postcode" to get around these problems.