Glen Koorey

Director and Principal Transportation Engineer/Planner at ViaStrada. Specialist in road safety and sustainable transport. Also handy with cricket and Lego...

[Glen Koorey @GKoorey]

With the current Govt looking to increase speed limits again in the name of "economic growth and improved productivity", it's useful to remind ourselves that past and current speed limit reductions have consistently seen much greater $$ gains from fewer deaths & serious injuries

[Glen Koorey @GKoorey]

@TheObserva2902 @AynRandy666 Interesting spin - the enforcement is mostly for drug/alcohol driving offences, which I think most people would agree should be "punished". Lower speed limits just induce people to slow down a bit (enforcement or not), which in turn reduces casualty numbers - basic physics

[Glen Koorey @GKoorey]

@ZooNealand @AynRandy666 Due to increased enforcement, plus all the lower speed roads/streets still out there around NZ - you're welcome...

[Glen Koorey @GKoorey]

@RobertAtatuPen @AynRandy666 Largely due to increased enforcement, which is good to see. But also because several roads & streets across the country still have lower speed limits (unlike Auckland that caved in and reversed most of them)

[Glen Koorey @GKoorey]

@TerryVercoe @Jamesnotabot @GreaterAKL The info in the Word doc summarises all of the data points in the chart (which was created using PowerPoint BTW)

[Glen Koorey @GKoorey]

@TerryVercoe @Jamesnotabot @GreaterAKL Try https://t.co/HEenuxQlQW and https://t.co/scjzXZ6wiw

[Glen Koorey @GKoorey]

@TerryVercoe @Jamesnotabot @GreaterAKL Well they are MS SharePoint links - perhaps I'll see if I can provide Google Drive links instead

[Glen Koorey @GKoorey]

@TerryVercoe @Jamesnotabot @GreaterAKL Hmm, I'm not seeing an issue with the first link; it hasn't expired and no idea why it would want access to your phone files. As for the graphic, you can try to download and save the image provided or you can get the original JPG at https://t.co/8WMwgO1ijK

[Glen Koorey @GKoorey]

@TerryVercoe @Jamesnotabot @GreaterAKL That's a bit weird, that link should just take you a view-only version of a Word doc summarising the stats - I guess I can see if the SharePoint link has expired...

[Glen Koorey @GKoorey]

@LertzAdam @GreaterAKL Agreed, lots of different things can contribute to why crashes happen. But then the speed at the time of the crash significantly determines the resulting consequences...

[Glen Koorey @GKoorey]

@LertzAdam @GreaterAKL That's why we tend to wait a bit until there are enough crash numbers to try to identify any patterns - certainly I'll be monitoring things over the next few years...

[Glen Koorey @GKoorey]

@TerryVercoe @Jamesnotabot @GreaterAKL Hmm, you're basing your evidence on a pseudo road safety expert, who is comparing 2021 numbers (featuring several periods of lockdowns) with 2022 (when traffic volumes went back up)? Here's my actual data: https://t.co/tCOdLeYrP7

[Glen Koorey @GKoorey]

@tmcnz101 @AndyStig @GreaterAKL Here's some actual data then...

[Glen Koorey @GKoorey]

@verminlionel @randomtwootera1 @GreaterAKL It's not about whether speed *causes* a crash - lots of factors often contribute. It's about the CONSEQUENCES of the resulting crash, depending on the speed at the time - that's basic physics

[Glen Koorey @GKoorey]

@TerryVercoe @Jamesnotabot @GreaterAKL Nope, the comparisons were made against similar road sections that didn't have their speed limits changed over the same time period - so traffic volume changes (whether during COVID or whenever) had the same effect on both of them

[Glen Koorey @GKoorey]

@LertzAdam @GreaterAKL Well, there have also been other fatalities on other roads recently increased - sure, early days, but let's remind ourselves again what happened when the speeds were previously lowered...

[Glen Koorey @GKoorey]

@chris_otautahi @tomforccc Funnily enough, City Council are currently investigating the safety effects of these stone Chch. Good example is Lincoln/Barrington intsn - from one of the worst crash records beforehand to no crashes since it was raised

[Glen Koorey @GKoorey]

@PostQuake @chrisluxonmp At least half of that cost is for reconstructing/improving road and utility infrastructure at the same time - you're welcome... And the calculated benefit:cost of the completed cycle network was at least 8:1 - show me the expressways that even produce a 2:1 B/C ratio...

[Glen Koorey @GKoorey]

@Mike1104376788 @_ConnorSharp @GreaterAKL Sure, that's why most recent ones would need more time to get more robust findings - didn't stop them from all reducing though... A pity that the Akld urban ones now have to go back up. And the earlier ones have plenty of data to demonstrate their effectiveness.

[Glen Koorey @GKoorey]

@Mike1104376788 @_ConnorSharp @GreaterAKL "...it's doubtful they reduced any accidents" - hmm...