Critical Speed Yaw Analysis, 2 hours with Wade Bartlett

DATE: Friday, 29 March 2024
TIME: 12 noon - 2 pm EDT (GMT-4)
COST: Free for NAPARS member;  $5 for non-members
LOCATION: Worldwide Via Zoom
ACTAR: This event has been approved by ACTAR for 2 CEUs. Signing in with i-Attend during the show will be required, so get i-Attend on your phone in advance, per the ACTAR info page here: https://actar.org/ceu/earning

Registered attendees will be able to request an attendance certificate during the show.

SUMMARY:

Curved tire marks are often found at crash scenes. The Critical Speed Yaw analysis is both a loved and hated technique because it is so easy to apply and has a long history showing reliability when used correctly (LOVE IT!), but it is also really easy to misapply (HATE IT!). Topics will include: the theory behind the math, including the assumptions that are baked into it; some of the references; testing over the years; Suggestions for making the measurements; Documentation; Some examples.

BIBLIOGRAPHY:

The ambitious viewer might want to look over a few of the citations we'll likely mention, including:

SAE 890635, Reveley

SAE 940723, Lambourn

ARJ Jan/Feb 95, Vol.7(1), Shelton

SAE 970957, Brach

SAE 970955, Bellion

SAE 2004-01-1187, MacInnis

Grass and Gravel Yaw Tests, Bartlett & Wright; 1st ITAI–EVU Conf, Hinckley UK, ‘09

CSY Tests w/ ABS & ESC on Pavement, Gravel, and Grass, Bartlett & Wright; ARJ 18(3), May/June 2008

Daily, Shigemura, Daily, Fundamentals of Traffic Crash Reconstruction, chapter 13

Traffic Crash Reconstruction, NUCPS, Lynn Fricke, Chapter 11