Traveler information from Probes

From the NY Times: Navigating With Feedback From Fellow Drivers . The article describe a GPS device from Dash Navigation in which every car is a probe, that reports information back other drivers in the club. This is an idea (hardly original I suspect) I analyzed in Levinson, D. (2002a) The Economics of Traveler Information from Probes. Public Works Management and Policy 6(4) pp 241-250 (April). The model in the paper implies probe information can be very good for detecting incidents, but will be almost useless for recurring congestion, because the lag in the data will be too long to take advantage of it.

Lower speed limits on residential streets in UK?

A new study reported by BBC: 20mph limit called for in towns
One of the interesting lines
“The Pacts report, called Beyond 2010 – a holistic approach to road safety in Great Britain, also recommends that all new residential developments should be subject to a “pint of milk test”.
This is whether a resident can reach a shop to buy a pint of milk in under 10 minutes without using a vehicle.”

Centers are edges

Centers are not nodes, in fact junctions are not nodes. In graphs (representation of transportation networks for modeling and analysis), nodes are aspatial representations of the intersection of links, which themselves are aspatial representations of the structure of network. However real nodes, i.e. centers and junctions, take space. As such they provide a spatial separation between areas that adjoin them. They serve as edges to adjoining areas (e.g. neighborhoods).
As Alfred Korzybski once said, “the map is not the territory”. Similarly, the graph is not the place. Network elements separate as they connect.

Shipping Container Architecture

Via Boing-boing: Making Light: Shipping container architecture. A really nice post about the use of excess shipping containers for housing and other purposes. With the disproportionately one-way flow of containerized commodities from Asia to the US, there are a surplus of containers landing on US shores (most are of course shipped back), the post details a number of articles about their reuse.

Car sharing and congestion pricing with compensation

Nice article from the Financial Times on carsharing: You take the hire road
“Streetcar fosters this sense of community by encouraging a sense of responsibility towards other club users. You are asked not to leave the car with the petrol tank less than a quarter full; if the car gets dirty, you are invited to earn an hour’s free rental by taking it to the car wash and getting it cleaned at Streetcar’s expense; and if you return the car late, keeping a neighbour waiting, you are fined £25 – of which £20 goes to your aggrieved fellow member.”
This is exactly the same logic behind the Delayer Pays Principle: Examining Congestion Pricing with Compensation (1.2 MB) (International Journal of Transport Economics 31:3 295-311) Peter Rafferty and I have posited for congestion pricing, those who cause delay pay those who they delayed.

a blog about Networks and Places

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