I expect a satellite navigation system would come in useful in your job," I said to the breakdown-truck driver. He agreed vehemently - not surprising, as he had just spent a frustrating hour driving south on the motorway, having not realised that the M11 exit he'd been heading towards is for northbound traffic only. So he had to drive past the place that he wanted for 10 miles, and drive another five north. The map might show that it's north-only, but you can't read a map and drive at the same time. "Some of the places I get sent to just aren't on the map," he said. It was hard to disagree, as my house with its dead car was one of them.
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