Emissions Due to Construction Equipment and Traffic Delays. Task 6: Contributionof Vehicular Emissions Caused by Reduction in Capacity during Roadway Construction

摘要

Task 6 modeled an array of possible construction work zone projects with respectto facility demand (low, medium, and high average annual daily traffic (AADT)); facility cross section (two to five lanes); number of lanes closed (one to four lanes); and work zone schedule (seven different schedules modeled). The work zone schedules included a base or typical schedule, overnight schedule, and schedules to accommodate the proposed construction bans in Dallas, Texas (banned from 06:00 to 10:00), and Houston, Texas (banned from 06:00 to 12:00), for peak and off-peak directions of flow. The Research team used QUEWZ-98 to calculate delays and road user costs associated with work zones and quantified operational characteristics of traffic flow through work zones, which served as input to the alternate emissions model (referred to as the Emissions Workbook) developed in this task. The results from the simulations were assembled into a large matrix table that had both the road user cost and emissions data. From this table, a series of graphs were created for each geometric/volume scenario with a series of curves representing the different road closure scenarios.