jm + crashes   3

Flawed analysis, failed oversight: How Boeing, FAA certified the suspect 737 MAX flight control system
omg this article is absolutely horrific. Boeing are in deep shit if this is borne out.
Like all 737s, the MAX actually has two of the sensors, one on each side of the fuselage near the cockpit. But the MCAS was designed to take a reading from only one of them.

Lemme said Boeing could have designed the system to compare the readings from the two vanes, which would have indicated if one of them was way off. Alternatively, the system could have been designed to check that the angle-of-attack reading was accurate while the plane was taxiing on the ground before takeoff, when the angle of attack should read zero.

“They could have designed a two-channel system. Or they could have tested the value of angle of attack on the ground,” said Lemme. “I don’t know why they didn’t.”

The black box data provided in the preliminary investigation report shows that readings from the two sensors differed by some 20 degrees not only throughout the flight but also while the airplane taxied on the ground before takeoff.
faa  aviation  boeing  737max  safety  fail  sensors  flight  crashes  mcas 
march 2019 by jm
Study: wearing hi-viz clothing does not reduce risk of collision for cyclists
Journal of Transport & Health, 22 March 2017:
This study found no evidence that cyclists using conspicuity aids were at reduced risk of a collision crash compared to non-users after adjustment for confounding, but there was some evidence of an increase in risk. Bias and residual confounding from differing route selection and cycling behaviours in users of conspicuity aids are possible explanations for these findings. Conspicuity aids may not be effective in reducing collision crash risk for cyclists in highly-motorised environments when used in the absence of other bicycle crash prevention measures such as increased segregation or lower motor vehicle speeds.
health  safety  hi-viz  clothing  cycling  commute  visibility  collision  crashes  papers 
october 2017 by jm
Shared Space and other bad junction designs lead to crashes and injuries
Just because something is "Dutch", that doesn't mean it's good. The Netherlands has many excellent examples, but you have to be very selective about what serves as a model. Cyclists fare best where their interactions with motor vehicles are limited and controlled. They fare best where infrastructure ensures that minor mistakes do not result in injuries.

Anywhere that we rely upon everyone behaving perfectly but where we do not protect the most vulnerable, there will be injuries. Good design takes human nature into account and removes the causes of danger from those who are most vulnerable.


via Tony Finch
cycling  design  junctions  shared-space  dutch  holland  roads  safety  crashes 
april 2014 by jm

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