Operating and Maintaining Median High Tension Cable Barrier on Highway 2 in Alberta
Bibliographic record
Abstract
In 2010, Alberta Transportation completed construction of 133 km of High Tension Cable Barrier (HTCB) in the median of Highway 2 from North of Airdrie to Red Deer and near Leduc. The design of this HTCB was complex due to the variety of median conditions when considering variables such as median width, sideslopes, and existing hardware in the median. Recent inquiries with HTCB suppliers indicate that this project remains the largest single HTCB installation in North America to date. This paper will present a comprehensive discussion of the various maintenance and operational issues and considerations for this HTCB installation. An issue which has resulted in the need for repairs of the HTCB is the cutting of the cable by first responders to free vehicles caught in the HTCB. Cutting of the cable can be hazardous due to the high tension in the system. To reduce the frequency of this occurrence and to minimize risk to first responders (firemen, police, and tow-truck operators), EBA provided training sessions in Leduc, Red Deer and Calgary. The content of, participation in and results of this training program will be discussed. Following the first year of operations a warranty inspection was completed and the observations and repair requirements are presented. Lessons learned from the review of these topics will be of use to road agencies that are proceeding with the use of this flexible barrier system that has proven to be effective in reducing the severity of cross median collisions in Alberta and elsewhere. For the covering abstract of this conference see ITRD record number 201310RT334E.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".