MDT does have a standard detail drawing for precast panels. However, MDT is not
currently using the precast panels that we have. The precast panels that are to
be built onsite have been hard to maneuver due to the weight of the rebar. If
you wuld like a copy of the details they are on our website at

www.mdt.mt.gov/other/contract/external/detailed_drawings/2005/english/section_60
8.pdf Detail 608-40 shows the panel.

Robin, this was asked before, and there is a related posting at
knowledge.fhwa.dot.gov/cops/hcx.nsf/discussionDisplay?Open&id=810F9DDBFD1982DE85
256FDB0059A5DE&Group=Detectable%20Warnings&tab=DISCUSSION#810F9DDBFD1982DE85256F
DB0059A5DE, which I copy:

Re: Safety and performance standards for detectable warnings
Ron McMahon, FHWA SD Div., ron.mcmahon@fhwa.sot.gov
04/06/2005
The SDDOT has determined for the reasons you mention that they are going to use
precast concrete detectable warning sidewalk elements. The standard plates can
be viewed at the following website:
www.sddot.com/pe/roaddesign/plates_index.asp Sidewalk Section 651 has all of
the standard plates. The precast detectable warning standard plate is 651.25.

There is a search function in upper right corner, select 'Detectable Warning'
and try a couple of likely key words.

best regards,

Mark

Mark R. Chandler, PE, CMfgE
U.S. DOT - FHWA Wisconsin Division
fax: 608-829-7526
office: 608-829-7514
office cell phone: 608-287-4226
mark.chandler@fhwa.dot.gov
www.fhwa.dot.gov/widiv/index.htm

Field Operations Engineer
Asst Coord for WisDOT's SW & NE Regions

Nevada dot allows concrete pavers and inlaid concrete panels. We have two
requirements other than the ADA specifications: [a] a minimum concrete strength
of 8000 psi and [b] specific color ranges to match our statewide landscape and
aesthetics master plan (sage green and brick red). In addition, for both
products we require the contractor to install the products per the
manufacturers recommendations.

Tile Tech Pavers is the leading manufacturer in precast Detectable Warning
Pavers & ADA Truncated Dome Pavers & Tiles meeting all ADAAG (4.29)
requirements. Our pavers are available nationally and are manufactured in a 700
ton hydraulic press resulting in a product that is 8,000 to 10,000 psi, (55
Mpa.) & less than 1% loss of weigh in Freeze Thaw conditions. These precast
Detectable Warning Pavers & ADA Truncated Dome Pavers come in 12"x 12" x 2" &
12"x 12" x 1" with a dome base diameter of 0.90" & a dome top diameter of 0.45"
with dome spacing form center to center at 2.35". They also come in in-line
formation for easy wheelchair access & in staggered formation to meet all DOT
requirements

They available in four standard colors, Charcoal, Yellow, Natural & Red, custom
colors are also available. Our standard colors provide the flexibility of
having a 70% contrast to the adjacent area as suggested in the ADAAG (A4.29.2).
This general formula appears to provide enough of a contrast to distinguish the
walking surface of the curb ramp from the roadway surface. Our pavers are
available nationally & are very economical especially for cities & government
projects. Pricing for our Detectable Warning Pavers & ADA Truncated Dome Tiles
varies between $5.00 – $7.00 per sqft. We are also approved by many states DOT
& are on their list of Approved Manufacturer/Products.

You can also see our product @ www.tiletechpavers.com/DetectablePavers.html

You can visit our site for PDF file of the full ADA Accessibility Guidelines @
www.tiletechpavers.com/DetectablePavers.html