Tag Archives: Infographics

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

 

 

Who pays for our roads?

There is still an assumption that those using cycles don’t pay their way on our roads. This is despite significant progress being made in recent years highlighting the misconceptions of vehicle excise duty, often mistakenly referred to as “Road tax” (ipayroadtax.com). Remembering that 80% of cyclists are also drivers, we think it is a good time to highlight the shared costs we all pay for these stretches of tarmac that dominate our urban environment.

The headline is that every taxpayer, every year, pays a road transport subsidy of £2,500. We’ve produced a handy infographic on who pays for roads.

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20mph saves emissions, energy AND lives

The 20mph debate rages on in Bristol, with murmurings of potential reversal, Bristol Cycle Campaign want to shed some facts on an important aspect – Energy and Emissions. We’ve even got a handy infographic.

One controversial argument often heard is that a vehicle travelling at 20mph has higher fuel consumption and emissions than at 30mph. Whilst it is true that the gearing on most passenger cars means that traveling on an empty motorway at 20 instead of 30 would use more fuel for the same distance, the same is not true in urban areas. Even during uncongested times these roads have junctions and traffic lights. It is almost impossible to safely navigate a city without stopping and starting.

Take a 4km journey with 7 stops 500m apart.

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Bike theft – impact on cycling

Bike theft is a huge issue in Bristol and there can few bike owners who don’t have a story to tell (Where are bikes being nicked, and who by?). This is a great infographic from Dublin Cycling Campaign that applies just as much to Bristol.

Some of the key points from survey:

  • 1 in 6 (17%) who have a bike stolen don’t replace their bike
  • A further 1 in 4 reduce the amount they cycle following their bike being stolen
  • Over 40% of stolen bikes were locked with a cable lock
  • Underground car parks and homes are as bad as streets for theft.

As DCC say “This is just one example of the how campaigns that we run can improve the cycling experience in Dublin. It all relies however, on people taking personal responsibility for changing things. The more people we have involved, the more we can do.”

Read the full article here Bike Theft Survey Results | Dublin Cycling Campaign.

We’ve got a bike security page with advice and information including two rather alarming videos…

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