Discover and read the best of Twitter Threads about #safetyoverspeed
Most recents (6)
@CityOfIowaCity raised the speed limit on a section of road. Reasoning that in the year has been open there have been no fatal crashes with peds = safe. Except their analysis is widely underpowered to detect an increase in risk. Like <5% power. #badstats #SafetyOverSpeed
If crashes happened before at 12 times a year, on average, they'd need the rate to *double* in order to have 80% power to find a signal. At 24 times/year, they'd need crashes to happen about 1.7 times more often.
For fatal crashes when happen less often (say 1 time per decade) they would need the rate to be well over 20 times worse than before to have a detectable signal.
Strong opening statements from @NTSB: "preventing a crash from happening in the first place is our top priority." and "If we do not improve roadway infrastructure for bicyclists, bicyclists will die who otherwise would not."
@NTSB Why is @NTSB doing this Bicycle Safety Report? According to @NHTSAgov , 806 bicyclists died in crashes with motor vehicles in 2017. ... and it has been 47 years since the @NTSB examined bicyclist safety
@NTSB @NHTSAgov In 2008 the @CDCgov @CDCChronic @CDCEnvironment set a healthy people 2020 goal for the bicyclist fatality rate at 0.22 deaths per 100,000 people. Since then the bicyclist fatality rate has increased and reached .26 deaths per 100k in 2016
At @AASHTOSpeaks Joint Policy Conference of Committee on Design and Council on Active Transportation (I'm a member of that). Flexible design workshop to kick it off. #infrastructure #RoadSafety 
Joyce Taylor, Maine DOT Chief Engineerb Over the years people have debated names for different approaches to streets that serve people. Let's call it GOOD DESIGN. #AASHTO #infrastructure #RoadSafety #PeopleStreets #HealthyStreets
Shari Schaftlein, FHWA Office of Human Environment, on context sensitive solutions/design. Case studies/resources fhwa.dot.gov/planning/css/. #AASHTO #infrastructure #RoadSafety #PeopleStreets
Kicking off my #aashtoAM tweeting with a few relevant tweets from #WalkBikePlaces below. And really, you should just go look at that whole thread if you work in transportation.
Why speed management is critical for safety, via @GoddardTara. It saves lives. #aashtoAM #safetyoverspeed #RoadSafety #WalkBikePlaces
Taking @RelayBikeShare in Atlanta bike infrastructure. Raised path an interesting experience--I like it. Celebratory 100-mile marker a nice touch--recognizes progress. #AASHTOam #infrastructure #BIKES TO #bikeshare
Kicking off #WalkBikePlaces with an infrastructure tour on @BlueBikesNOLA. Several under way now; I'm on the one that looks at public art, placemaking. #bikeNOLA
First stop: Jackson Square, National Historic Site, named for Andrew J. Led battle that saved NOLA in 1812 but owned enslaved people. Should his statue come down? #WalkBikePlaces
Beautiful murals! Families of Plessy and Ferguson reconciled with art in celebration. Studio BE right across the street--big studio space in covered warehouse. @BlueBikesNOLA station right here at park.
Pilot in BC Canada: @velometro 3-wheeled enclosed #ebikes operating as shared vehicles. Think Car2Go+bike. Geofenced to keep off pedestrian walkways. #TRBAM 
If @velometro classified as bikes they can be in bike lanes but you couldn't park these at a bike rack. Lots of policy issues to be worked through. #TRBAM #bikeshare (?)
