Bollards vs. Dectable Warning Bands (California)

[Robert Anderson]

Dustin,

I was just talking to some colleagues about this last week. I too recalled that there are accommodations for warnings other then truncated domes. The only thing I could find was in ADAAG A4.4.1 fig A4 for cane technique. The problem with this is that you end up having a preponderance of bollards. We are somewhat sensitive to forests of bollards here in the DC area because of there over use.

Good Luck in your search.

Robert

[Jason T. Radice]

There is no other accomodation in the ADAAG other than truncated domes for detectable warning, that is pretty much the only thing in the ADAAG that does not have a substitue. Also, the DOT has adopted the 2′ deep truncated dome as the universal tactile warning device. There is no substitution.

[Dustin Maxam, PLA, ASLA]

Thanks guys for replying.  Here is what I found in the ADAAG:

The question still remains…

what it are “Other Elements” and do bollards at a certain spacing qualify?

4.29.5 Detectable Warnings at Hazardous Vehicular Areas.

If a walk crosses or adjoins a vehicular way, and the walking surfaces are not separated by curbs, railings, or other elements between the pedestrian areas and vehicular areas, the boundary between the areas shall be defined by a continuous detectable warning which is 36 in (915 mm) wide, complying with 4.29.2.

3.5 Definitions: 

Detectable Warning. A standardized surface feature built in or applied to walking surfaces or other elements to warn visually impaired people of hazards on a circulation path.

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