Situation A – Road with light vehicles and semi-trailers only#
For temporary alignments where traffic is substantially made up of light vehicles with only a small percentage of heavy vehicles no larger than a semi-trailer, projects typically apply lane and edge clearances in accordance with the department's Queensland MUTCD Part 3. This then leads to a minimum cross-section for a two-lane two-way temporary road as detailed in Table 4.1.3.3(a).
| Speed (km/h) | Lane width (m) | Edge Clearance width (m) | Total width (m) |
|---|---|---|---|
| 40 | 3.0 | 0.3 | 6.6 |
| 60 | 3.0 | 0.5 | 7.0 |
| 80 | 3.5 | 0.5 | 8.0 |
The review of lane widths supported narrower widths in some cases but these were predominantly in situations where there were at least two lanes in a single direction. It is therefore not considered that further reductions in lane width are appropriate in circumstances with a single lane in each direction separated only by barrier line. There are however considered to be opportunities to reduce the edge clearance in line with the adopted Main Roads WA practice. These barrier offsets have some precedent in Queensland on sections of road in constrained situations and across bridges. This then results in the potential cross-section widths outlined in Table 4.1.3.3(b).
| Speed (km/h) | Lane width (m) | Edge Clearance (m) | Total width (m) | Cross section reduction compared to AGRD03 Table 5.1(m) |
|---|---|---|---|---|
| 40 | 3.0 | 0.2 | 6.4 | 0.2 |
| 60 | 3.0 | 0.3 | 6.6 | 0.4 |
| 80 | 3.2 | 0.5 | 7.4 | 0.6 |
