Federal Performance Measures

Level of Travel Time Reliability (LOTTR)

LOTTR assesses the consistency, or dependability, of travel times from day to day or across different times of the day on the interstate and non-interstate NHS systems. The Federal Highway Administration (FHWA) defines LOTTR as the percent of person per miles on the interstate and NHS that are reliable. LOTTR is calculated as the ratio of the longer travel times (80th percentile) to a “normal” travel time (50^th percentile), using NPMRDS or equivalent data.

Data are collected in 15-minute segments between 6 a.m. and 8 p.m. Reliability measures were grouped into three weekday time periods (6-10 a.m., 10 a.m. – 4 p.m., 4-8 p.m.) and one weekend time period (6 a.m. – 8 p.m.).

Level of Truck Travel Time Reliability (LOTTTR)

FHWA defines Level of Truck Travel Time Reliability (LOTTTR) as the percent of truck per miles on the interstate system that are reliable. LOTTTR is calculated as the ratio of the longer travel times (95th percentile) to a “normal” travel time (50th percentile), using NPMRDS or equivalent data.

Data are collected in 15-minute segments throughout the day. Reliability measures were grouped into three weekday time periods (6-10 a.m., 10 a.m.-4 p.m., 4-8 p.m.), one weekend time period (6 a.m. – 8 p.m.), and one overnight time period for all days (8 p.m.-6 a.m.).

Peak-Hour Excessive Delay Per Capita

The extent of traffic congestion is measured by the number of transportation system users that are affected by congestion. FHWA measures this by the annual hours of peak hour excessive delay (PHED) per capita on the NHS in the Cincinnati, OH-KY-IN Urbanized Area. The threshold for excessive delay is based on the travel times at 20 miles per hour or 60 percent of the posted speed limit travel time, whichever is greater, and is measured in 15-minute intervals. Peak travel hours are defined as 6-10 a.m. and 3-7 p.m. each weekday.

Non-Single Occupancy Vehicle Travel

Measuring non-single occupancy vehicle (SOV) travel, within an urbanized area, recognizes investments within the Cincinnati region that increase multimodal solutions and vehicle occupancy levels as strategies to reduce congestion and criteria pollutant emissions.

Modes of transportation recognized: carpool, vanpool, public transportation, commuter rail, walking, bicycling and tele-commuting.

Total Congestion Mitigation and Air Quality (CMAQ) Emission

The 2015 Cincinnati ozone area includes portions of the Ohio counties of Butler, Clermont, Hamilton and Warren; and the Kentucky counties of Boone, Campbell and Kenton. On June 9, 2022, The U.S. Environmental Protection Agency (EPA) found that the Cincinnati, Ohio area had attained 2015 ozone National Ambient Air Quality Standard (NAAQS) and have been redesignated to a maintenance area. In July 2023, EPA found that the Kentucky portion of the Cincinnati area had attained 2015 ozone NAAQS and has been redesignated to a maintenance area. With those new designations the OKI region is still required to maintain 2015 ozone standards and complete air quality conformity for both the Transportation Improvement Program (TIP) and the Metropolitan Transportation Plan (MTP). Ozone is formed through chemical reactions induced when sunlight reacts with volatile organic compounds (VOC’s) and oxides of nitrogen (NOx).

Forty CMAQ-funded transportation projects within the OKI region from 2019-2023 provided quantitative emissions benefits. These projects included traffic operations and safety improvements; roadway relocations and widenings; new turn lanes; bicycle and pedestrian facility improvements and additions; and bus replacements.