Search found 1791 matches
- Tue Dec 19, 2023 9:18 am
- Forum: Highway Safety
- Topic: FHWA MUTCD 11th Edition now available
- Replies: 0
- Views: 1488
FHWA MUTCD 11th Edition now available
On December 19, 2023, a final rule adopting the 11th Edition of the Manual on Uniform Traffic Control Devices for Streets and Highways—the MUTCD—was published in the Federal Register. The new MUTCD includes a number of updates to improve safety for pedestrians, bicyclists, and all road users. States...
- Sat Dec 16, 2023 1:17 pm
- Forum: What Is?
- Topic: What is Closing Speed?
- Replies: 6
- Views: 26032
Re: What is Closing Speed?
I just realized i had promised to post up traditional closing speed calculation: Closing Speed Calculation Velocity Closing = A*Velocity1 - B*Velocity2 where Zeta = ATAN2(YCP2-YCP1,XCP2-XCP1) = space fixed angle between the Veh1 & Veh2 XCP1,XCP2 = Veh1 & Veh2 Space Fixed X coordinates YCP1,Y...
- Sat Dec 16, 2023 12:27 pm
- Forum: Vehicle Safety
- Topic: Is a Telsa "Recall' an Actual Recall? or Merely a Software Update?
- Replies: 0
- Views: 2927
Is a Telsa "Recall' an Actual Recall? or Merely a Software Update?
Drives me crazy when they talk of safety 'Recalls' of Telsa. Tesla issues massive recall of more than 2 million vehicles over autopilot safety concerns Tesla’s largest recall won’t fix Autopilot safety issues, experts say It even has topped the lists of many: The Biggest Car Recalls in History, Upda...
- Fri Dec 15, 2023 9:52 am
- Forum: Specs, Crash Tests, Etc.
- Topic: Motorcycle Downshift Acceleration Studies
- Replies: 0
- Views: 4175
Motorcycle Downshift Acceleration Studies
Question on another forum brought up this article SAE 2020-01-0880 , Quantifying Engine Braking for Various Common Street Motorcycles by Jansen, LeBlanc, Wilhelm, Shaw, et al. _________ ABSTRACT Motorcycle engine braking was measured in each forward gear for a cross-section of typical street motorcy...
- Wed Dec 13, 2023 12:12 pm
- Forum: EDR CDR Related Topics
- Topic: Effects of Vehicle Braking on EDR Pre-Impact Speed
- Replies: 10
- Views: 21831
Re: Effects of Vehicle Braking on EDR Pre-Impact Speed
Added some comments, links, etc to several of the posts
NOTE: since this is the 11th post, use the icon in lower right of the screen to go to other postings on this topic
NOTE: since this is the 11th post, use the icon in lower right of the screen to go to other postings on this topic
- Tue Dec 12, 2023 9:30 am
- Forum: EDR CDR Related Topics
- Topic: 109 MPH Crash, Collision Magazine Article, msmac3D Recon
- Replies: 9
- Views: 17413
Re: 109 MPH Crash, Collision Magazine Article, msmac3D Recon
Moved a link to the DRAFT copy of the article to the first post for folks who don't register...
- Mon Dec 11, 2023 8:01 am
- Forum: EDR CDR Related Topics
- Topic: Effects of Vehicle Braking on EDR Pre-Impact Speed
- Replies: 10
- Views: 21831
Re: Effects of Vehicle Braking on EDR Pre-Impact Speed
Figure, comments and references added to prior posting from SAE 2016-01-1497 paper.
- Sun Dec 10, 2023 10:53 am
- Forum: EDR CDR Related Topics
- Topic: Effects of Vehicle Braking on EDR Pre-Impact Speed
- Replies: 10
- Views: 21831
Re: Effects of Vehicle Braking on EDR Pre-Impact Speed
Another response was posted to the other forum i will summarize here and provide my answer: Q: Just to throw in an example the vehicle had speeds reported every 0.1 seconds. The collision was on wet roads, so realistically we are probably looking at values of mu no higher than 0.8 g. The last few re...
- Sun Dec 10, 2023 10:36 am
- Forum: EDR CDR Related Topics
- Topic: Effects of Vehicle Braking on EDR Pre-Impact Speed
- Replies: 10
- Views: 21831
Re: Effects of Vehicle Braking on EDR Pre-Impact Speed
Look forward to evaluating that, if possible. First question: where did the speedometer data come from? a video? was this a full scale test? and/or why no EDR data? and how did you synch the speedometer with the ADR data? Second question/observation: location, location, location! In the picture it a...
- Sat Dec 09, 2023 11:41 am
- Forum: EDR CDR Related Topics
- Topic: Effects of Vehicle Braking on EDR Pre-Impact Speed
- Replies: 10
- Views: 21831
Re: Effects of Vehicle Braking on EDR Pre-Impact Speed
When you mention ADR (Accident Data Recorder), i'm not sure what you mean? Do you mean the accelerations of the crash from airbag module data and then integrating to get the impact speed change and then when combined with the other vehicle (unless into a wall) get the impact velocity? Could you prov...