Roadway Network
Database

Overview

The Polk TPO monitors traffic congestion on about 425 roadway segments (950 directional links) within Polk County. The Roadway Network Database provides current traffic data for all arterial and collector roads, which are the major roads in the county.

View the 2023 Roadway Network Database

Traffic Data

The database includes information on current traffic volume and level-of-service for these major roads. Key metrics include:

• Daily Traffic Volumes: Reported as Annual Average Daily Traffic (AADT), representing the typical traffic volume on a weekday over a 24-hour period and
• Peak Hour Traffic Volumes: The highest hourly traffic volume between 4 – 7 p.m., reported as both a two-way volume and as directional volumes (east-west or north-south).

Level-of-Service (LOS)

Peak hour traffic volumes are used to estimate the level-of-service for each roadway in each direction. LOS is a measure of traffic congestion, rated on a scale from ‘A’ to ‘F’:

• LOS A Free-flow traffic
• LOS F: Severe traffic congestion (similar to a parking lot)