The contentious issue of charging Bristolians for on-street parking has been enough to drag the mysterious Bristol Blogger out of retirement. And with good reason: £40 quid a year per vehicle plus the hassle of having to arrange permits for visitors and tradesmen, and no guarantee that you'll be giving permission by the council to park a second car. If this were declared as an increase in council tax, it would be equivalent to a minimum of 3% on every Band D household.

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As a local car owner, I don't like this policy, both because I'm already paying more tax than I want to, and because I don't believe that stringent council-led ticketing and control is the right way to solve the problem (although is it a problem? see below). My preference would be a wholesale mutualisation of non-trunk roads, to let individual home owners form friendly associations to manage their street, their approach to parking control and how much to spend on up-keep. Wearing my small business hat, I'm already investigating the purchase price of high-density, small-footprint urban parking structures, which could be a potential area of growth regardless of how we choose to respond to parking.

Coming soon to Bristol

The trouble is that if just one area of the city did decide to go down the route of Parking Control, then the knock on effect would be to increase parking in neighbouring areas. This results in a city-wide version of The Prisoner's Dilemma.

Two suspects are arrested by the police. The police have insufficient evidence for a conviction, and, having separated both prisoners, visit each of them to offer the same deal. If one testifies ("defects") for the prosecution against the other and the other remains silent, the betrayer goes free and the silent accomplice receives the full 10-year sentence.

If both remain silent, both prisoners are sentenced to only six months in jail for a minor charge. If each betrays the other, each receives a five-year sentence. Each prisoner must choose to betray the other or to remain silent. Each one is assured that the other would not know about the betrayal before the end of the investigation. How should the prisoners act?

If all areas of the city vote against Parking controls, then everybody get's a good result. But if only one area votes in favour whilst their neighbours take the opposing view, then that dissenting area will displace cars into the neighbouring areas. Therefore even those who are against the scheme have an incentive to vote in favour.

Redefining the problem

If we define the problem to be "too many cars on the road", the general consensus amongst drivers seems to be that the solution is better public transportation systems for other drivers. But very few people have any desire to make the "modal shift" themselves.

But if one defines the problem as excess demand at peak times - outside the rush hour, there's plenty of roadspace and traffic moves freely - then perhaps we should try to do a bit more to incentivise road use outside peak times. How about something simple, which requires no capital investment, no new staff, no consultations, no free "Our City" newsletters, no focus groups and no extra money from car drivers or council tax payers: Let's switch traffic lights to flashing amber outside busy hours. This would improve traffic flow on major roads and might persuade commuters to change their daily pattern. Simple, cheap and easy to test.

Who Watches the Watchman?

watchmanIn late news, the council are running a further consultation on "the possible introduction of state-of-the-art safety measures aimed at reducing dangerous driving and protecting lives in two areas of the city."

Bristol City Council is proposing the introduction of comprehensive Watchman Safety Schemes at Long Cross in Kings Weston - between the junctions with Kings Weston Rd and Stile Acres - and at Whiteladies Road in Clifton, between the junctions with Lower Redland Road and West Park.

Both roads have relatively high accident rates. There were 63 reported accidents on Whiteladies Road in total between January 2005 and December last year - with two people killed and nine seriously injured. At Long Cross there were 27 reported accidents during the same period, with six people being seriously injured. Speed was an issue in a large number of the accidents at both locations.

If the new Watchman schemes get the go ahead, safety cameras would be installed in both directions on the two roads. They would be switched on around the clock and would record the number plates of any vehicles breaking the speed limit. Vehicle Activated Signs (VAS) would also be installed in advance of the cameras to warn motorists where they are exceeding the speed limit - and there would be clear signs to advise road users when they are entering the zones.

Fines would not be issued instantly, as with most other speed cameras, but police would be able to follow up any driving above the speed limit captured on film and consider prosecution.

A similar scheme has been in operation at Allison Road, Brislington for the past year and over that time traffic speeds have dramatically decreased and no new personal injury accidents have been recorded.

I wonder whether the Allison Road scheme will continue to deliver such benefits? The key phrase for consideration is "Post Hoc Ergo Propter Hoc", with extra credit for a study of "Regression toward the Mean".