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#1
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Anyone experience loss of control (ie crash) from bridge road vibration
Fri AM I was making my typical commute to work. A block before my office
is a bridge with a metal grate for a road bed (perhaps 3" squares?). I have ridden my bike over this bridge at least 100 times with almost no problems. A few times I have felt a very brief shimmy of my front wheel, but always have regained control in a split second in rain or shine. On Friday I felt my front wheel begin to shimmy immediately. I was constantly trying to regain control and nearly went over on both left and right sides a couple times. I finally did lose control and remember that grating coming at me as I fell. I was wearing my helmet albiet I did not hit my head. My right forearm though took a beating and I received a bone chip on my elbow. I spent the morning at the ER getting a deep wound cleaned, xrays, tetanus shot, antibiotics (dirty bridge ), and pain pills. Thank God the driver behind me stopped with ample room (his vehicle was slightly touched by the car behind him). He helped me off the roadway and called my office as my cell phone was destroyed, and I was in shock and not sure could have called. The real reason for this post isn't for sympathy (but it is welcome ) but to see if there may be a reason this happened this time. BTW, I will walk this stretch in the future. Bike: Hybrid Tires: Not skinny, not mountain (bike at work so can;t check now) Filled tubes that AM to max psi (6 on whatever that 'other' scale is) Two panniers Differences: One pannier heavier than usual so slightly unbalanced, although I have ridden at times with only one heavy pannier with no problem. LOTS of big concrete trucks on roadway at time - I think moving slowly. It is a two lane each direction draw bridge. Bridge was recently retrofit for streetcars in the middle of roadway. Regular service of streetcars began a week ago. There may have been a streetcar or two on bridge. Maybe it was a coincidence waiting to happen - maybe something else. Ideas? Similar experiences? TIA Robert |
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#2
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Anyone experience loss of control (ie crash) from bridge road vibration
On Apr 15, 9:46 am, Robert Larson wrote:
Fri AM I was making my typical commute to work. A block before my office is a bridge with a metal grate for a road bed (perhaps 3" squares?). I have ridden my bike over this bridge at least 100 times with almost no problems. A few times I have felt a very brief shimmy of my front wheel, but always have regained control in a split second in rain or shine. On Friday I felt my front wheel begin to shimmy immediately. I was constantly trying to regain control and nearly went over on both left and right sides a couple times. I finally did lose control and remember that grating coming at me as I fell. I was wearing my helmet albiet I did not hit my head. My right forearm though took a beating and I received a bone chip on my elbow. I spent the morning at the ER getting a deep wound cleaned, xrays, tetanus shot, antibiotics (dirty bridge ), and pain pills. Thank God the driver behind me stopped with ample room (his vehicle was slightly touched by the car behind him). He helped me off the roadway and called my office as my cell phone was destroyed, and I was in shock and not sure could have called. The real reason for this post isn't for sympathy (but it is welcome ) but to see if there may be a reason this happened this time. BTW, I will walk this stretch in the future. Bike: Hybrid Tires: Not skinny, not mountain (bike at work so can;t check now) Filled tubes that AM to max psi (6 on whatever that 'other' scale is) Two panniers Differences: One pannier heavier than usual so slightly unbalanced, although I have ridden at times with only one heavy pannier with no problem. LOTS of big concrete trucks on roadway at time - I think moving slowly. It is a two lane each direction draw bridge. Bridge was recently retrofit for streetcars in the middle of roadway. Regular service of streetcars began a week ago. There may have been a streetcar or two on bridge. Maybe it was a coincidence waiting to happen - maybe something else. Ideas? Similar experiences? TIA Robert Hi Robert, We have a few of those bridges in downtown Chicago, over the Chicago River. They are not on my daily commute, but every once in awhile I have found myself on one of them. My strong feeling is, they are not suitable for ANY bike traffic. My BF has 20" wheels, 1.5" tires. The vibration is very bad, and if you need to turn right or left suddenly, you will be really stressed. I have had my share of bike wrecks with personal injury (to myself). They have always been my fault, for just being reckless. My suggestion is, as you say - use another route, or walk it across the bridge - J. |
#4
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Anyone experience loss of control (ie crash) from bridge roadvibration
Mike,
Thanks for this link. I had planned to contact the SF Bike Coalition tomorrow regarding this. I will also contact a friend that sometimes does bridge consulting work. Robert Mike Kruger wrote: wrote: Robert Larson wrote: On Apr 15, 9:46 am, Robert Larson wrote: Fri AM I was making my typical commute to work. A block before my office is a bridge with a metal grate for a road bed We have a few of those bridges in downtown Chicago, over the Chicago River. They are not on my daily commute, but every once in awhile I have found myself on one of them. My strong feeling is, they are not suitable for ANY bike traffic. My BF has 20" wheels, 1.5" tires. The vibration is very bad, and if you need to turn right or left suddenly, you will be really stressed. On at least one bridge in Chicago there is a bike-friendly strip over such a bridge. This is due to a campaign by Kathy Schubert, who had a similar accident. The story is available if you scroll down a few inches he http://www.biketraffic.org/biketraffic/BT0105/ |
#5
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Anyone experience loss of control (ie crash) from bridge road vibration
Robert Larson wrote:
Fri AM I was making my typical commute to work. A block before my office is a bridge with a metal grate for a road bed (perhaps 3" squares?). I have ridden my bike over this bridge at least 100 times with almost no problems. A few times I have felt a very brief shimmy of my front wheel, but always have regained control in a split second in rain or shine. On Friday I felt my front wheel begin to shimmy immediately. I was constantly trying to regain control and nearly went over on both left and right sides a couple times. I finally did lose control and remember that grating coming at me as I fell. I was wearing my helmet albiet I did not hit my head. My right forearm though took a beating and I received a bone chip on my elbow. I spent the morning at the ER getting a deep wound cleaned, xrays, tetanus shot, antibiotics (dirty bridge ), and pain pills. snip Ideas? Similar experiences? I had one "major pucker moment" on a tandem in Florida, on a similar steel grate bridge. My wife and I were cranking up over the small hill before the bridge at a pretty good clip (somewhere around 20mph. There was a very light drizzle that had just started falling, and apparently this liberated the oil that was on the steel. So now we found ourselves trying to balance on tiny, oily, wet pieces of steel. I felt the back wheel break loose, and yelled "don't move" to my wife (who knew to do just that). As I corrected for the rear wheel slide, I felt the front wheel break loose. We went across the second half of the grating sliding one way and then the other - but thankfully never too far off-axis, and I was able to keep the bike upright (you do NOT want to go down on that "cheese-grinder surface" on a tandem. Very likely you encountered a bit of oil during your crash - when that happens, there's almost no lateral stability, and the front tire is likely to skate far enough to make the slide unrecoverable. Mark Hickey Habanero Cycles http://www.habcycles.com Home of the $795 ti frame |
#6
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Anyone experience loss of control (ie crash) from bridge road vibration
metal is bad for traction any moisture and it is very slippery. myself
I would not ride on that surface unless I absolutely had too just too dangerous. |
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