TGSI Design Requirements
Integrated Directional TGSIs
Course: DD-021 | Length: 6:19 mins | Instructor: Dean Homicki
Chapters
00:23 - Learning Overview
01:22 - Learning Session
01:38 - Let’s Begin
05:40 - Learning Resources
Transcript
This learning session will cover the use of:
Directional TGSIs and the Design Requirements for Integrated TGSI Types.
Welcome to staebl.academy TGSI Design Diagram 021. I’m Dean Homicki and I’ll be your guide for this course.
Learning Overview
We begin by asking,
‘How are Integrated TGSIs defined in the Australian TGSI Standard?’
The Australian TGSI Standard describes an Integrated TGSIs as, ‘Tactile Ground Surface Indicators (TGSIs) that are, in a defined pattern and which are of the same Luminance and material as the Base Surface.’
What are the Design requirements of Integrated TGSIs?
There are two types of Integrated TGSIs. These types are defined as Integrated Warning TGSIs and Integrated Directional TGSIs.
In this learning session, we will review Integrated Directional TGSIs. Integrated Warning TGSIs are reviewed in a previous module DD-020
Learning Session
Let’s take a closer look at the technical details outlined in Figure 3.1, Amendment No.1, of the Australian TGSI Standard. A summarised version of these requirements follows herein.
Let’s Begin.
The Truncated Bars of Integrated Directional TGSIs, shall each have:
a height of: 4 to 5 mm above the entire Base Surface and,
shall be of a length of between: 240 to 590 +/- 2 mm,
with Drainage Gaps of: 10 +/- 2 mm at 250 to 600 mm centres,
have a diameter at each base of: 35 +/- 1 mm,
have a diameter at each Upper Surface of: 25 +/- 1 mm and
each be evenly spaced apart in a defined pattern of 75 +/- 5 mm, measured from the centre of each Truncated Bar.
Each Integrated Directional TGSI Module must have, Luminance-Contrast to the background, or the adjacent Path of Travel as follows:
Integrated: Not less than 30% Luminance-Contrast across its entire area.
Each Integrated Directional TGSI Module shall also be slip-resistant.
In Australia, to determine a TGSI’s slip-resistance rating and it’s classification, the trafficable surface of the TGSI needs be tested in accordance with AS 4586: 2013 and, installed in conjunction with Standards Australia Handbook HB 198: 2014 - Guide to the specification and testing of slip resistance of pedestrian surfaces.
Let’s take a look at the dimensionality of Integrated Directional TGSIs. We are going to now convert this image into a Plan view line drawing and reveal the dimensionality of the TGSI Arrangement (Pattern).
Here’s the line drawing of the image.
The Truncated Bars are evenly spaced apart in a defined pattern of 75 +/- 5 mm. This spacing is measured from the centreline of each Truncate Bar, along its length, to the centre of adjacent Truncated Bar. The Truncated Bars must also be parallel to each other.
When Integrated Directional TGSIs modules are installed together, (side-by-side), it is important that the 75 +/- 5 mm spacing between each Truncated Bars is maintained. This means that from the outer edge of the Integrated Directional TGSI module to the centre of the Upper Surface of the Truncated Bar, the spacings will be 37.5 +/- 2.5 mm. The length of the Truncated Bar at its Base Surface shall be between 240 to 590 +/- 2 mm.
When Integrated Directional TGSIs are installed together, (end-to-end), along a Continuous or Path or Direction of Travel, it is important that the Drainage Gaps of 10 +/- 2 mm between each Truncated Bar is maintained. This means that from the outer edge of the Integrated Directional TGSI module to of the Base Surface of the Truncated Bar will be 5 +/- 1 mm.
These measurements will also achieve the correct arrangement of Integrated Directional TGSIs with
Figure 3.1 of the Australian TGSI standard.
In an Elevation View of the Integrated Directional TGSIs, we can see that, the Height of each Truncated Bar is 4 to 5 mm, that the Upper Surface Diameter of is 25 +/- 1 mm, and that the Base Surface Diameter 35 +/- 1 mm.
Learning Resources
That’s the conclusion for Design Requirements of Integrated Directional TGSIs.
You can also access this course as a concise series of design diagrams in the resource section of our website staebl.academy/design. To access this resource now, click on the link below this video.
Thanks for joining me here at the staebl.academy. I look forward to guiding you through another learning session in the near future. Bye for now.
Listen
Click/Tap the audio player below to listen to the written transcript of this design session as an audible version. This is a streamed broadcast from the Staebl.academy site.
Diagrams
Click/Tap on an image from this learning session to view it as a larger picture. You will then be able to scroll through each individual design diagram in this slide-deck for a closer inspection.
Sources
TSA-TGSI-LEARN-DD-021 - This staebl.academy course module has drawn information from the following sources:
AS/NZS 1428.4.1: 2009 (Amendments 1 & 2) Design for Access and Mobility: Means to assist the orientation of people with a vision impairment - Tactile Ground Surface Indicators - Clause 1.4.12 (AMDT No. 1 NOV 2010), Section 2, 2.2 (b) & (b i), Section 3, 3.2 General Requirements, 3.2.1 (c) & (d), 3.2.2 Design Requirements, 3.2.3, Fig 3.1 (a), (b) & (c) AMDT No.1 NOV 2010, Appendix E.E2 Luminance Contrast Requirements - 1st and 2nd Paragraph, Appendix A1 Wayfinding (b).
