First, a graph:
(Click on images to enlarge.)
At the beginning of April, Greg Raisman of the Portland (Oregon) Transportation Department gave a talk for Boston Health Associates about the effect of speed on the severity of accidents. (The second speaker Barry Keppard, Manager of the Boston Metropolitan Area Planning Commission, Public Health Division, talked about the effects of lowering traffic speed, which parallels the efforts of bike advocates in NYC to reduce speed limits on side streets to 20 mph.) Greg showed a most excellent graph (above) on Fatality Risk versus Collision Speed. I had struggled with these statistics while writing my Helmet blog post, because I knew that an electric bike was faster, but the best data for estimating the increased risk that I could find were simple bar graphs with only two or three bars- not very good for communicating to others who are thinking about traveling faster on an electric work bike. Greg's graph is from a presentation that P. Wramborg gave at a road safety conference in Warsaw in 2005. Looking at the "Pedestrian or Cyclist" curve on the left, the (unprotected) human body does a really good job of surviving a crash up to about running speed (12-15 mph), and then from 20-25 mph the curve becomes a threshold, above which the risk of dying increases very quickly. When I started this bike project a couple of years ago I had been thinking of 40 mph speeds between towns to make using a bicycle more feasible for errands, but after a year of measuring elapsed times I've realized that the average speed matters as much as top speed. My car may top out at 50 mph for several miles of my trip to White River, but most of the trip is at slower speeds with stops, and the car's average speed is actually only 26 mph. A consistent 20 mph on an electric bike would be significant. I now think these are feasible design speeds for future bikes:
-50 mph- is over the top and becoming a moped
-40 mph- upper limit, since I already reach 42 mph coasting downhill on the bakfiets
-30 mph- electric motor plus strong pedaling, (note that you cannot do this with a pedelec system which turns the motor off above 20 mph.)
-25 mph- I often reach 22-25 mph with moderate pedaling on the bakfiets.
-20 mph- the federal speed limit for bicycle motor assist "when powered solely by a motor, of less than 750 watts (1 h.p.), on a paved level surface with a 170 pound rider" (HR 727 Consumer Product Safety Act, Section 1).
-5 to 15 mph- standard Oma (upright) commuter bike speed, and the speed I ride my bakfiets in closer quarters.
I now like a design goal of 30 mph for the intermittent open stretches of the trip (and downhills) to raise the average speed and increase bike use feasibility, with a 750 watt motor for my steepest hills that I can't ride up right now with 500 watts. The usual traveling speeds should end up below the greatly increased chance of injury, and it will be legal (remember I hand these bikes off to other people). FYI- you'll note from the other two curves in the graph that being in a car increases the speed you can survive by about 12 mph for a side impact, and another 12 mph for a head on collision, which is not a lot considering all the safety equipment in a car.
Update added on July 21, 2014: California does not allow electric assist above 20 mph:
Item 3 of California V C Section 406 states: "Is incapable of further increasing the speed of the device when human power is used to propel the motorized bicycle faster than 20 miles per hour."
A second safety item was a great drawing by Bikeyface:
Roads have been a commons through out most of human history, and only in the last 100 years have they become subservient to the automobile. Cars, light trucks, and buses probably reached 1 billion globally in late 2010 (http://wardsauto.com/ar/world_vehicle_population_110815), but bikes had reached 1 billion globally somewhere a bit before 2000 (http://www.worldometers.info/bicycles/). The gap has only gotten wider, as car and bike annual production was about equal up to 1965, but in the last 3 decades there have been twice as many bikes produced as cars, and the trend seems to be growing, (World Watch Earth Policy Institute, see my earlier Helmet and Safety post for a fuller discussion). Bikes by all rights should be getting more infrastructure dollars, but for most countries this has led to public policy arguments and political funding fights instead.
BIKES vs CARS TRAILER from WG Film by Fredrik Gertten. (http://www.bikes-vs-cars.com/)
"This is not a war. It's a city. We should live together in peace."
At an International Transportation Forum in Berlin on June 6, 2011, B.K. Chaturvedi, member of India's Planning Commission told the 800 delegates: "We in India need to provide more roads and rail. Cycling is a miniscule thing. That's not the future." Asian countries expressed the same sentiment for their developing economies, (http://www.ipsnews.net/2011/06/bike-vs-car-on-a-hot-planet/).
Photo credit unknown, probably in Oregon at a festival.China is accelerating development of Electric Vehicles, but this is still bad news for resource use, congestion, and making real connections. To me increasing the number of cars is pretty much Planet Down the Tubes material. This is too big to be my fight, so I'm looking for what I can do here and now.
The Oregon Department of Transportation has released a good study of the effectiveness of bike lanes, Lessons from the Green Lanes: Evaluating Protected Bike Lanes in the U.S. and they find them to be very good for safety and perceived safety (i.e. convincing more people to bike). This is a good report, and I love the graphics.
Here is a series of 4 very brief videos about changing infrastructure, speed limits, numbers, and the overall health benefits from cycling being 20 times greater than the risk from accidents and air pollution:
"The benefits of cycling outweigh the risks by 20 to 1."
From the Cycling, Health, and Safety working group report
There isn't enough money to extend infrastructure to all the roads in Vermont and it is a slow process, so I think I have to work with the roads we have. I do think the infrastructure that we have in urban areas does indirectly benefit rural roads, because auto drivers get reminded there are bikes on the road. However if VT AOT could fund more bike infrastructure that would be great.
The three foot minimum passing distance rule. Photo credit: Kent SchramEducation (and repetition, repetition, repetition of it in an engaging way) are needed for all road users about how to interact with each other. I'm learning about riding for myself, and hope that agencies will spread information to other road users.
My last option is making bikes work better on existing roads. I admit I am a bit biased towards the bikes I am building, because their capabilities enable me to mesh with traffic flow better than a typical sporting bike. This can be good (easy for me), or bad (it enables a transportation system built for only cars, and it doesn't do a thing for other bikes).
Did I mention helmets?
A bicycle helmet cannot do this, but it doesn't have to either.
Bicycle speeds are much slower. Photo credit: unknown
Commuting on a work bicycle is not the same thing as racing on a high power motorcycle.
This is what commuter biking looks like. Tram, pedestrians, bikes, and cars.
Photo credit: Unknown (location probably northern Germany)
More of what bicycling looks like. Photo credit unknown.
Bicyclists in Europe lined up at a intersection stop. Photo credit unknown.
Bicycling Without Ages Program, Seniors on a ride, Oslo, Norway.
Dutch biking ad. Photo credit www.stuffdutchpeoplelikebook.com
Oops sorry, wrong photo. This is not commuter or work biking.
Photo credit Steven Lloyd Photography
Lane separation using just speed bumps, Germany. Photo credit unknown.
Regional Director for Mercedes in Ukraine on Bike to Work Day. Photo credit unknown.
Can you spot the difference between racing and commuting?
Photo credit: unknown
Children Cycling to School, Graph credit: European Cyclists Federation
Why is it that the countries that are most obsessed with bike helmets,
(USA, Canada, Australia, UK), have the least experience with biking?
One of the most insightful replies was posted by Adonia Lugo related to her transportation equality study, Planning for Diverse Use/rs: Ethnographic Research on Bikes, Bodies, and Public Space in LA:
"Bicycling is legal on city streets in the United States. No laws keep motorists in their cars. This is not a situation where people's everyday practices have been disrupted by state apparatuses that govern through direct force, such as military police or an invading national power. And yet, an estimated 33,885 people died while using streets in the United States in 2009, according to the National Highway Traffic Safety Administration (2010). Of that number, 4,280 were pedestrians and 618 were cyclists, which means the vast majority of that estimate refers to dead motorists and their passengers. In the same year, an estimated 2,239,000 people were injured while using surface streets and highways. Bike advocates frame these injuries and fatalities as a design issue- with street infrastructure designed specifically for cycling in place, fewer people would drive. Instead of taking the built environment's role for granted, I chose to consider that this might be a case of discipline, the 'internalization of standards that are then enacted through bodily compliance.' (Foucault, 1977)"
After the Bicycle Petting Zoo I had to ride to the other side of Brattleboro, and the best route was through the center (1.4 miles) on downtown roads with continuous parked cars. With the electric assist on the bakfiets I was able to travel as fast as the cars (25 mph), with the cars accelerating away at the stop lights and then I'd catch up in a couple of hundred feet. I rode in the regular travel lanes like a motorcycle. (To some extent bikes like this make the need for bike lanes superfluous, but the catch is still taking care of all the other bikes that can't travel this fast.) The only problem was climbing the uphill out of the center with a one foot wide shoulder before the curbing. I stayed as far right as I could, but a small sedan behind me at the light just had to pass. It was pitiful, as he had the accelerator floored and wasn't traveling much faster than me, and then I had to stop and wait for him to turn at the next stop sign. He had a large error from his car centered view of the world but could not see it, and I had to deal with it.
Cars were truly amazing inventions of human creativity when I was a kid in the 1960's, and I still think some car driving is very special. But with increasing Vehicle Miles Driven per capita, I have watched them become an appliance, a unit in traffic. (You are not stuck in traffic, you are traffic.) I would argue that they have moved beyond the obesity, diabetes, heart disease, pollution, asthma, sprawl and environmental degradation linked to car use, and have now become a retreat from connection with the world around us and our thoughts. This should be enough reasons to use a car less, but most people will not be able to make a change.
What is risk? Is the limitation of risk such as envisioned by conservative financial investors and military advisers really applicable to bicycle riding? Is not walling off part of life a sign of decline? I'd like to end this post with a bit of philosophy. As Martha Nussman states about Euripedes' play Hecuba in the second half of this discussion with Bill Moyers, a life without openness, without trust, without risk, is not a human life:
Martha Nussmann, The Fragility of Goodness, interview with Bill Moyers, 1988
"This says something very important about the human condition and ethical life, that it is based on a trust in the uncertain and a willingness to be exposed; it's based on being more like a plant than a jewel, something rather fragile, but whose very particular beauty is inseparable from that fragility." Wrapping ourselves in a 3000 pound steel cocoon and telling ourselves that we are safe is a deception. Driving a 40 mile commute everyday at 65 mph is a distortion of reality. The everyday actions that we take- often just to get by- are what actually creates our world. How deeply do we wish to live?
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