Tag Archives: Infographics

7 Reasons Einstein would support 20 mph

ACTION:  Please take a moment to respond to the Bristol 20mph Review

Our lives fundamentally rely on energy. It puts food on our table, gets us to and from work, powers our offices and factories. The more we use, the more money it costs us. Our demand for it causes wars, our generation of it emits harmful gases.

Almost every issue 20mph raises is energy related and the answer to each, along with many of our urban challenges, can be found by looking for the lowest energy solution.

Energy dictates the severity of a collision, how much fuel is burnt to move somewhere and the volume of emissions that activity will release. The more energy we put through car components and the road surface the quicker they will break and wear out. The faster a vehicle moves the more noise it generates.

Yet energy is rarely mentioned. Despite apparent concerns over climate change and air pollution, sales of energy-hungry SUVs are soaring, up 24% across Europe this year and on course to become the most common cars on our roads.

So in this time of “fake news” and manipulation of facts, what better way to argue a case than with some basic physics. Just as keen cyclist Albert Einstein might have done. Here are the seven reasons (also as an infographic here):

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The staggering cost of motoring

Last month many of you will have received Bristol Councils “Council tax explained” leaflet, explaining where our council tax pounds are spent. The centre page of this is an infographic summarising costs per household. Transport services set us back £83.52 and highways £29.26. Reading into the images used, this might be interpreted as tax payers forking out 3 times more for cycling and public transport than highways infrastructure (which cyclists also use). However regardless of how much Bristol Council spend on transport, these figures pale into insignificance when compared with how much many of us fork out of our own pockets each year.

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Cycling vs the Electric Car

Electric vehicles have received a lot of press over the past few months. This furore has even led some to suggest that EVs are more efficient than food powered humans riding bicycles.

So we at Bristol Cycling have put together an unapologetically technical article in an attempt to shed some light on this.

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Cycling hospital admissions in 2016

Bristol Cycling regularly requests data from local hospitals on the number of admissions by transport mode. Below is an infographic breaking down the collisions that resulted in cyclists being admitted to hospital in 2016.

Take away messages might be:

  1. Take care to avoid leaves, curbs, potholes and, especially, ice
  2. Avoid cars (Space for Cycling anyone?)

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Induced Traffic and Traffic Evaporation

The recent debate on the proposed Callington “Relief” Road has brought the concept of “induced traffic” back into the limelight. And also the the related and much neglected evidence for “reduced traffic“, or the delightful concept of “traffic evaporation”. So what do these terms mean?

Induced Traffic

As car ownership and use have increased over the past 30 years the reaction to the pressure created by additional traffic demand has often been to increase the level of supply, in other words, provide additional road space. There is a growing body of evidence indicating that the benefits of creating additional road capacity are not as significant as was previously believed. In many cases, the provision of new road links simply increases congestion problems. This occurs through a process that is known as traffic ‘induction’. In 1994, the UK Government-commissioned Sactra report provided evidence on the impact of new road building on traffic levels in the area of the scheme. The report revealed that when new road capacity is provided, overall traffic levels in the vicinity of the scheme actually increase. The evidence does not offer a reliable means of predicting the extent of this traffic increase but case studies suggest that it is typically around 10 % in the short term, and 20 % in the longer term. In our cities, such as Bristol, there is an additional reason as to why the provision of additional road capacity is problematic for city planners — there is simply a lack of available space in which to expand.

Two recent reports from the Campaign to Protect Rural England on “the Impact of Road Projects in England” and “The End of the Road, Challenging the Road Building Consensus” discuss the latest evidence on the failure of road building projects to do anything more than attract more cars, increasing noise, air pollution and accidents. There is also is sound research evidence to back the benefits and impacts of pedestrian improvements and road closures as set out in the new website from the UWE Centre for Transport and Society.

Traffic Evaporation

So if building or widening roads causes more traffic, what happens when capacity is restricted or redirected? Chaos, surely? Well the evidence points to something else, something that unexpected, a phenomenon that has been called traffic evaporation, disappearing traffic, traffic suppression, or, more generally, reduced demand. The fact is that some traffic is displaced to other modes, and some simply vanishes, with no seeming inconvenience or disruption.

Case Study – Wolverhampton Town Centre

This case study examines a response to intense traffic congestion, worsening environmental conditions and declining economic activity in Wolverhampton in the face of competition from other shopping centres in the city of Telford to the west, and the Merry Hill complex to the south-east, and additional planned retail centres. In 1986, the local authority commissioned ‘The Black Country Integrated Transport study’ which concluded that building more roads would not solve the growing transport problems.

A more effective strategy would be to give greater priority to public transport and to put greater emphasis on improving the urban environment by creating an attractive physical space that would meet the public’s expectations. The response was a four-stage strategy, central to which was the removal of approximately 8 000 through-traffic cars per day from the city centre. The predicted traffic congestion did not occur. A significant percentage of traffic appears to have disappeared from the city centre, a result which could not be solely explained by displacement to other routes.

Below we’ve put together a short storyboard showing how the theories of induced traffic and traffic evaporation play out in reality.

The concept of “Induced Traffic” and “Traffic Evaporation”

Download our handout from the Callington Road meeting: 

Induced traffic and evaporation

 

 

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