Expanding on Methodologies for Analyzing Truck Speeds in States with Differential Speed Limits
The Federal Motor Carrier Safety Administration (FMCSA) and National Highway Traffic Safety Administration (NHTSA) reported that in 2020, 7.3% of large truck driver fatalities had speed as a contributing factor. Several states have implemented truck differential speed limits (DSLs) with the objectiv...
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| Format: | Article |
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MDPI AG
2024-11-01
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| Series: | Safety |
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| Online Access: | https://www.mdpi.com/2313-576X/10/4/99 |
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| author | Gregory L. Brinster Jairaj Desai Rahul Suryakant Sakhare Jijo K. Mathew Darcy M. Bullock |
| author_facet | Gregory L. Brinster Jairaj Desai Rahul Suryakant Sakhare Jijo K. Mathew Darcy M. Bullock |
| author_sort | Gregory L. Brinster |
| collection | DOAJ |
| description | The Federal Motor Carrier Safety Administration (FMCSA) and National Highway Traffic Safety Administration (NHTSA) reported that in 2020, 7.3% of large truck driver fatalities had speed as a contributing factor. Several states have implemented truck differential speed limits (DSLs) with the objective of improving safety. This study compares truck speeds in 16 states, 8 of which have implemented DSLs (Arkansas, California, Idaho, Indiana, Michigan, Montana, Oregon, and Washington) and 8 of which have not (Illinois, Kentucky, Minnesota, Oklahoma, South Dakota, Tennessee, Wisconsin, and Wyoming). The DSLs ranged from 55 MPH in California (CA) to 70 MPH in Montana (MT). Over 240,000 speed samples from connected trucks were analyzed during a one-week period from 15–22 April 2024. The 50th percentile truck speeds ranged from 60 MPH in Oregon to 69 MPH in Wyoming. The 85th percentile truck speeds ranged from 65 MPH in Washington, Oregon, and California to 74 MPH in Wyoming. The 85th percentile speeds across all segments were greater than the posted truck speed limit in 90% of segments with DSLs, but only 12.5% of segments without DSLs. The average interquartile range (IQR) of truck speeds for the eight states with DSLs was 19% smaller than the average IQR of the eight states without DSLs. The methodologies and visuals presented by this study are easily scalable to any route and location provided the availability of a representative connected truck dataset. |
| format | Article |
| id | doaj-art-a446c252f878464eb9cb3ad5f2aeb693 |
| institution | DOAJ |
| issn | 2313-576X |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Safety |
| spelling | doaj-art-a446c252f878464eb9cb3ad5f2aeb6932025-08-20T02:57:21ZengMDPI AGSafety2313-576X2024-11-011049910.3390/safety10040099Expanding on Methodologies for Analyzing Truck Speeds in States with Differential Speed LimitsGregory L. Brinster0Jairaj Desai1Rahul Suryakant Sakhare2Jijo K. Mathew3Darcy M. Bullock4Joint Transportation Research Program, Lyles School of Civil and Construction Engineering, College of Engineering, Purdue University, West Lafayette, IN 47907, USAJoint Transportation Research Program, Lyles School of Civil and Construction Engineering, College of Engineering, Purdue University, West Lafayette, IN 47907, USAJoint Transportation Research Program, Lyles School of Civil and Construction Engineering, College of Engineering, Purdue University, West Lafayette, IN 47907, USAJoint Transportation Research Program, Lyles School of Civil and Construction Engineering, College of Engineering, Purdue University, West Lafayette, IN 47907, USAJoint Transportation Research Program, Lyles School of Civil and Construction Engineering, College of Engineering, Purdue University, West Lafayette, IN 47907, USAThe Federal Motor Carrier Safety Administration (FMCSA) and National Highway Traffic Safety Administration (NHTSA) reported that in 2020, 7.3% of large truck driver fatalities had speed as a contributing factor. Several states have implemented truck differential speed limits (DSLs) with the objective of improving safety. This study compares truck speeds in 16 states, 8 of which have implemented DSLs (Arkansas, California, Idaho, Indiana, Michigan, Montana, Oregon, and Washington) and 8 of which have not (Illinois, Kentucky, Minnesota, Oklahoma, South Dakota, Tennessee, Wisconsin, and Wyoming). The DSLs ranged from 55 MPH in California (CA) to 70 MPH in Montana (MT). Over 240,000 speed samples from connected trucks were analyzed during a one-week period from 15–22 April 2024. The 50th percentile truck speeds ranged from 60 MPH in Oregon to 69 MPH in Wyoming. The 85th percentile truck speeds ranged from 65 MPH in Washington, Oregon, and California to 74 MPH in Wyoming. The 85th percentile speeds across all segments were greater than the posted truck speed limit in 90% of segments with DSLs, but only 12.5% of segments without DSLs. The average interquartile range (IQR) of truck speeds for the eight states with DSLs was 19% smaller than the average IQR of the eight states without DSLs. The methodologies and visuals presented by this study are easily scalable to any route and location provided the availability of a representative connected truck dataset.https://www.mdpi.com/2313-576X/10/4/99differential speed limitsconnected truck datatruck speedssafety |
| spellingShingle | Gregory L. Brinster Jairaj Desai Rahul Suryakant Sakhare Jijo K. Mathew Darcy M. Bullock Expanding on Methodologies for Analyzing Truck Speeds in States with Differential Speed Limits Safety differential speed limits connected truck data truck speeds safety |
| title | Expanding on Methodologies for Analyzing Truck Speeds in States with Differential Speed Limits |
| title_full | Expanding on Methodologies for Analyzing Truck Speeds in States with Differential Speed Limits |
| title_fullStr | Expanding on Methodologies for Analyzing Truck Speeds in States with Differential Speed Limits |
| title_full_unstemmed | Expanding on Methodologies for Analyzing Truck Speeds in States with Differential Speed Limits |
| title_short | Expanding on Methodologies for Analyzing Truck Speeds in States with Differential Speed Limits |
| title_sort | expanding on methodologies for analyzing truck speeds in states with differential speed limits |
| topic | differential speed limits connected truck data truck speeds safety |
| url | https://www.mdpi.com/2313-576X/10/4/99 |
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