Functional Class

Road segments that carry a designated functional class: the federal classification, running from interstate down to local road, that describes the role a road plays in the network. Functional class drives federal aid eligibility, design standards and much of how the network is reported.

Published by: ODOT Office of Technical Services, Roadway Information GIS
Source: Ohio Department of Transportation TIMS
Original data: tims.dot.state.oh.us
Terms of use: Public information, no warranty (ODOT)
On the map: Lines

Ask State Planner a question about this data in plain language, and get the answer as a written explanation and a map.

From the publisher

Sections of the Road Inventory that have designated values for the FHWA approved Functional Class system.

Questions answered with this data

For the MVRPC metropolitan planning area around Dayton (the MVRPC polygon in the MPO data set, which covers Montgomery, Miami, Greene and the northern part of Warren County), count fatal and serious-injury crashes for each year from 2021 through 2025, counting each crash report once by its crash severity. Use the same scope as MVRPC's Safety Action Plan: leave out crashes on restricted-access freeways (functional class 1 and 2, which covers I-70, I-75, I-675 and the freeway sections of US 35 and SR 4), crashes on freeway ramps, and crashes with no location. Split each year into urban and rural, where urban means inside ODOT's Adjusted Urbanized Areas. Show one table with a row per year and columns for urban fatal, rural fatal, urban serious injury, rural serious injury, and total fatal plus serious injury. Then show a second table, by year, of the fatal and serious-injury crashes that the freeway and ramp exclusions removed. Map the counted crashes colored by severity, draw the excluded freeway crashes in gray, and outline the MVRPC boundary and the urbanized areas.

Fields

What each record holds, as the publisher describes it: 8 fields.

Field	Description
ObjectID OBJECTID
PERP_YEAR	Calendar year in which a RI event occurs (like new constructions, abandoning of roads, annexations, increase in speed limit, and so on) on a roadway and is recorded in ODOT’s RI database.
ODOT_DISTRICT	From 1-12 plus Central Office – the counties are grouped into districts in Ohio for ease of maintenance and funding
JURISDICTION_CD	Type of jurisdiction to which the section of the route belongs. C-county, F-federal, M-municipal, P-private, S-state, T-township.
ROUTE_SUFFIX	Route suffix used to differentiate routes with similar route numbers.
ROUTE_EXTENSION_CD	Route suffix provides additional context or definition of route naming or usage.
CARDINALITY_CD	Cardinal/non-cardinal direction of the route. All roadways are inventoried in the predominant direction from south to north and west to east.
FUNCTION_CLASS_CD	The organization of roadways into a hierarchy based on the character of service provided. 1- Principal arterial interstate, 2-Principal arterial freeway, 3-Principal arterial other, 4-Minor arterial, 5-Major collector, 6-Minor collector, 7-Local.

More from Ohio Department of Transportation TIMS

Every Ohio data set