Seasonal AADT DHV Factors.xlsx

This is a Seasonal Average Annual Daily Traffic (AADT) and Design Hour Volume (DHV) Factors spreadsheet compiled by the Maine Department of Transportation (MaineDOT), Traffic Engineering Division-Traffic Monitoring Section. The document provides weekly adjustment factors for traffic count data collected at 161 monitoring locations throughout Maine, covering three data collection years (2018, 2019, and 2021). The file contains 52 weeks of seasonal factors organized by location, grouped into three categories (Group I, Group II, and Group III), with separate factors for directional traffic patterns (Direction 1, Direction 2, and combined 1+2). Each monitoring site is identified by station ID number, location name, and route designation (such as state routes, US highways, and interstate highways including I-95, I-295, and I-395). The factors enable MaineDOT to convert short-duration traffic counts into annual estimates by accounting for seasonal and weekly variations in traffic patterns. Data collection years span from December 2017 through December 2022, with some sites showing partial data availability or notation of equipment relocations and weigh-in-motion (WIM) station operational status changes.

The spreadsheet represents historical traffic monitoring data essential for MaineDOT's traffic engineering and planning functions, directly supporting the proposed Traffic Count Software as a Service (SaaS) solution referenced in RFP #202510141. This dataset demonstrates the volume and complexity of traffic information that the new cloud-based platform must manage, process, and integrate—approximately 5,000-7,000 annual portable Short Duration Counts and 130+ Continuous Count Sites requiring standardized seasonal adjustment factors. The factors contained in this file will require conversion and integration into the new SaaS system during implementation, ensuring continuity of MaineDOT's traffic data analysis and federal reporting compliance under HPMS and TMAS submission requirements. No pricing, funding, or procurement information is contained within this technical reference document; it serves solely as supporting reference material defining the scope and nature of traffic count data management required under the broader RFP initiative.