Offset to fixed objects on urban streets

Safety performance functions, development (calibration, crash modification factors [Part C], crash proportions), IHSDM and other software

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Offset to fixed objects on urban streets

Postby dengstro » Wed Feb 15, 2012 4:57 pm

How are parking lanes taken into account to determine the offset to a fixed object. Oftentimes, the street does not have and edgeline strip to delineate the parking lane from the travel lane. Additionally, if curb and gutter have been installed, where do you measure from - the curb face or gutter/pavement interface?
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Re: Offset to fixed objects on urban streets

Postby mdimaiuta » Tue Feb 21, 2012 1:19 pm

With regards to parking lanes, I would refer to the 2011 AASHTO "Green Book" definition of "clear zone" (p. 4-15) in determining the offset to a fixed object; i.e., "The clear zone includes...auxiliary (e.g., parking) lanes unless the auxiliary lane functions like a through lane."

If curb and gutter have been installed, my best guess is that the offset would be measured from the gutter/pavement interface, since the curb/gutter are not part of the traveled way.

I will do some more research on these issues...

- Mike Dimaiuta
FHWA Geometric Design Lab / HSM Support
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Re: Offset to fixed objects on urban streets

Postby dengstro » Tue Feb 21, 2012 5:28 pm

Thanks, Makes sense
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