Design of a TL-4 Median Cable Barrier for Deerfoot Trail, Calgary
Bibliographic record
Abstract
This paper describes the preliminary engineering and design, by EBA Engineering Consultants Ltd. (EBA), of a National Cooperative Highway Program (NCHRP) 350: Test Level 4 (TL-4) high-tension (pre-stretched post-tensioned) cable barrier installed in May 2007 in the depressed median of an 11 km stretch of the Deerfoot Trail in Alberta, Canada. The paper reports the results of the research regarding the available TL-4 cable barriers approved by the US Federal Highway Administration (FHWA). The paper discusses important design considerations, such as the post spacing and allowable maximum deflection of the cable barrier, and the recent revisions to the AASHTO Roadside Design Guide. For the Deerfoot Trail project, a design deflection of 2.4 m (8 ft) and a maximum post spacing of 6.1 m (20.0 ft) was specified. The median cable barrier was placed 4.0 m from the edge of the travel lane (the painted shoulder line). This minimized the interaction with existing barrier systems, and allowed for emergency vehicles to park or pass on the inside shoulder. The authors believe that the research and design of the high tension cable barrier described in this paper should be of interest to future similar projects in Canada.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".