National Academies Press: OpenBook

Guidelines for Slope Traversability (2019)

Chapter: Appendix A. Classification of Vehicle Body Types by NHTSA

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Page 168
Suggested Citation:"Appendix A. Classification of Vehicle Body Types by NHTSA." National Academies of Sciences, Engineering, and Medicine. 2019. Guidelines for Slope Traversability. Washington, DC: The National Academies Press. doi: 10.17226/25415.
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Page 168
Page 169
Suggested Citation:"Appendix A. Classification of Vehicle Body Types by NHTSA." National Academies of Sciences, Engineering, and Medicine. 2019. Guidelines for Slope Traversability. Washington, DC: The National Academies Press. doi: 10.17226/25415.
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Page 169
Page 170
Suggested Citation:"Appendix A. Classification of Vehicle Body Types by NHTSA." National Academies of Sciences, Engineering, and Medicine. 2019. Guidelines for Slope Traversability. Washington, DC: The National Academies Press. doi: 10.17226/25415.
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Page 170
Page 171
Suggested Citation:"Appendix A. Classification of Vehicle Body Types by NHTSA." National Academies of Sciences, Engineering, and Medicine. 2019. Guidelines for Slope Traversability. Washington, DC: The National Academies Press. doi: 10.17226/25415.
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Page 171

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161 APPENDIX A - CLASSIFICATION OF VEHICLE BODY TYPES BY NHTSA

162 CLASSIFICATION OF VEHICLE BODY TYPES BY NHTSA (1991 and later years, except as noted) INDEX – BODY TYPE DESCRIPTION 01 – Convertible (excludes sunroof, T-bar) 02 – 2-Door Sedan/Hardtop/Coupe 03 – 3-Door/2-Door Hatchback 04 – 4-Door Sedan/Hardtop 05 – 5-Door/4-Door Hatchback 06 – Station Wagon (excluding van and truck-based) 07 – Hatchback, number of doors unknown 08 – Other auto (1991 - 1993 only) 08 – Sedan/Hardtop, number of doors unknown (since 1994) 09 – Unknown auto type (1991 - 1993 only) 09 – Other or Unknown automobile type (since 1994) 10 – Auto-Based Pickup 11 – Auto-Based Panel (cargo station wagon, auto-based ambulance or hearse) 12 – Large Limousine - more than 4 side doors or stretch chassis 13 – Three-Wheel Automobile or Automobile Derivative 14 – Compact Utility (ANSI D-16 Utility Vehicle Categories: “Small” and “Midsize”) 15 – Large Utility (ANSI D-16 Utility Vehicle Categories “Full Size” and “Large”) 16 – Utility Station Wagon 19 – Utility Unknown Body 20 – Minivan 21 – Large Van – Including van-based buses 22 – Step Van or Walk-In Van 23 – Van Motorhome (deleted in 2003 and later) 24 – Van-Based School Bus (1993 to 2002 only) 25 – Van-Based Transit Bus (1993 to 2002 only) 28 – Other Van Type (Hi-Cube Van) 29 – Unknown Van Type 30 – Compact Pickup (Gross Vehicle Weight, GVWR, < 4,500 lbs) 31 – Standard Pickup (4,500 lbs ≤ GVWR < 10,000 lbs) 32 – Pickup with Slide-In Camper 33 – Convertible Pickup 39 – Unknown (pickup style) Light Conventional Truck Type 40 – Cab Chassis-Based (includes light stake, light dump, light tow, rescue vehicles) 41 – Truck-Based Panel 42 – Light-Truck-Based motorhome (chassis mounted) 45 – Other Light Conventional Truck Type (includes stretched suburban limousine) 48 – Unknown Light Truck Type (not a pickup) 49 – Unknown Light Vehicle Type (automobile, utility vehicle, van or light truck) 50 – School Bus 51 – Cross-Country/Intercity Bus (i.e., Greyhound) 52 – Transit Bus (city Bus) 58 – Other Bus Type 59 – Unknown Bus Type 60 – Step Van

163 61 – Single-Unit Straight Truck (10,000 lbs. < GVWR ≤ 19,500 lbs.) 62 – Single-Unit Straight Truck (19,500 lbs .< GVWR ≤ 26,000 lbs.) 63 – Single-Unit Straight Truck (GVWR>26,000 lbs.) 64 – Single-Unit Straight Truck (GVWR unknown) 65 – Medium/Heavy Truck-Based Motorhome 66 – Truck/Tractor (cab only, or with any number of trailing units: any weight) 67 – Medium/Heavy Pickup (GVWR > 10,000 lbs.) [since 2001] 71 – Unknown if single-unit or combination unit Medium Truck (10,000 lbs < GVWR < 26,000 lbs) 72 – Unknown if single-unit or combination-unit Heavy Truck (GVWR>26,000 lbs.) 73 – Camper or Motorhome, Unknown Truck Type 78 – Unknown Medium/Heavy Truck Type 79 – Unknown Truck Type 80 – Motorcycle 81 – Moped (motorized bicycle) 82 – Three-Wheel Motorcycle/Moped - Not All-Terrain V 83 – Off-Road Motorcycle (2-wheel) (since 1993) 88 – Other Motored Cycle Type (mini-bikes, motor scooters) 89 – Unknown Motored Cycle Type 90 – ATV (all-terrain vehicle; includes 3 or 4 wheels) 91 – Snowmobile 92 – Farm Equipment Other Than Trucks 93 – Construction Equipment Other Than Trucks (includes graders) 94 – Motorized Wheel Chair (since 1997) 97 – Other Vehicle Type (includes go-cart, forklift, city street sweeper, dune/swamp buggy, golf cart) 99 – Unknown Body Type

Next: Appendix B. Risk Measures and Statistical Methods »
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TRB’s National Cooperative Highway Research Program (NCHRP) has released a pre-publication version of Research Report 911: Guidelines for Slope Traversability, which includes guidelines for determining the traversability of roadside slopes considering the characteristics of the current passenger vehicle fleet.

As part of development of this report, researchers performed full-scale traversability tests and compared the performance of the vehicles with the simulations performed for the same test conditions.

Rollovers are the leading cause of fatalities in single vehicle ran-off-road (SVROR) crashes. Analysis of six years of data from the National Automotive Sampling System Crashworthiness Data System indicates that 31% of SVROR crashes result in a rollover. Approximately 75% of these rollover crashes are initiated by vehicles digging into the ground on embankments or in ditches after encroaching onto the roadside.

Development of NCHRP Research Report 911 was prompted by concern that some roadside slope conditions that have for many years been considered traversable for passenger cars may not be traversable for light trucks. With the steadily increasing percentage of light trucks in the vehicle fleet, further research was needed to determine what should be considered as safe sideslope conditions for today’s vehicle fleet. Proper assessment of slope traversability may help reduce the number of rollover crashes and associated fatalities.

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