Highway Safety Improvement Project Categories
(Source: HSIS Safety Improvements Database)
While a single project may consist of multiple project types, each project should be assigned to only one category and sub-category combination. The category/sub-category chosen should align with the primary purpose of the project.
| Category | Sub-category | Output Measure |
|---|---|---|
| Access management | Access management – other | # miles or # access points |
| Change in access – close or restrict existing access | # miles or # access points | |
| Change in access – miscellaneous/unspecified | # miles or #access points | |
| Grassed median – extend existing | # miles | |
| Median crossover – close crossover | # miles or # crossovers | |
| Median crossover – directional crossover | # miles or # crossovers | |
| Median crossover – relocate existing | # miles or # crossovers | |
| Median crossover – unspecified | # miles or # crossovers | |
| Raised island – install new | # miles | |
| Raised island – modify existing | # miles | |
| Raised island – remove existing | # miles | |
| Raised island – unspecified | # miles | |
| Advanced technology and ITS | Advanced technology and ITS – other | # intersections or # units |
| Congestion detection / traffic monitoring system | # miles or # units | |
| Dynamic message signs | # locations or # signs | |
| Over height vehicle detection | # locations | |
| Alignment | Alignment – other | # miles |
| Horizontal curve realignment | # curves | |
| Horizontal and vertical alignment | # miles | |
| Vertical alignment or elevation change | # miles | |
| Animal-related | Animal related | # miles or # locations |
| Interchange design | Acceleration / deceleration / merge lane | # miles or # locations |
| Convert at-grade intersection to interchange | # intersections | |
| Extend existing lane on ramp | # miles or # ramps | |
| Improve intersection radius at ramp terminus | # intersections | |
| Installation of new lane on ramp | # miles or # ramps | |
| Interchange design – other | # interchanges | |
| Ramp closure | # ramps | |
| Ramp metering | # ramps | |
| Intersection geometry | Auxiliary lanes – add acceleration lane | # intersections or # lanes |
| Auxiliary lanes – add auxiliary through lane | # intersections or # approaches | |
| Auxiliary lanes – add left-turn lane | # intersections or # approaches | |
| Auxiliary lanes – add right-turn lane | # intersections or # approaches | |
| Auxiliary lanes – add right-turn lane (free-flow) | # intersections or # approaches | |
| Auxiliary lanes – add slip lane | # intersections or # approaches | |
| Auxiliary lanes – add two-way left-turn lane | # miles | |
| Auxiliary lanes – extend acceleration/deceleration lane | # intersections or # approaches | |
| Auxiliary lanes – extend existing left-turn lane | # intersections or # approaches | |
| Auxiliary lanes – extend existing right-turn lane | # intersections or # approaches | |
| Auxiliary lanes – miscellaneous/other/unspecified | # intersections or # approaches | |
| Auxiliary lanes – modify acceleration lane | # intersections or # approaches | |
| Auxiliary lanes – modify auxiliary through lane | # intersections or # approaches | |
| Auxiliary lanes – modify free-flow turn lane | # intersections or # approaches | |
| Auxiliary lanes – modify left-turn lane offset | # intersections or # approaches | |
| Auxiliary lanes – modify right-turn lane offset | # intersections or # approaches | |
| Auxiliary lanes – modify turn lane storage | # intersections or # approaches | |
| Auxiliary lanes – modify turn lane taper | # intersections or # approaches | |
| Auxiliary lanes – modify two-way left-turn lane | # miles | |
| Intersection geometrics – miscellaneous/other/unspecified | # intersections | |
| Intersection geometrics – modify intersection corner radius | # intersections or # approaches | |
| Intersection geometrics – modify skew angle | # intersections or #approaches | |
| Intersection geometrics – realignment to align offset cross streets | # intersections | |
| Intersection geometrics – realignment to increase cross street offset | # intersections | |
| Intersection geometrics – re-assign existing lane use | # intersections or # approaches | |
| Intersection geometry – other | # intersections or # approaches | |
| Splitter island – install on one or more approaches | # approaches | |
| Splitter island – remove from one or more approaches | # approaches | |
| Splitter island – unspecified | # approaches | |
| Through lanes – add additional through lane | # intersections or # approaches | |
| Intersection traffic control | Intersection flashers – add "when flashing" warning sign-mounted | # intersections or # approaches |
| Intersection flashers – add advance emergency vehicle warning sign-mounted | # intersections or # approaches | |
| Intersection flashers – add advance heavy vehicle warning sign-mounted | # intersections or # approaches | |
| Intersection flashers – add advance intersection warning sign-mounted | # intersections or # approaches | |
| Intersection flashers – add miscellaneous/other/unspecified | # intersections or # approaches | |
| Intersection flashers – add overhead (actuated) | # intersections | |
| Intersection flashers – add overhead (continuous) | # intersections | |
| Intersection flashers – add stop sign-mounted | # intersections or # approaches | |
| Intersection flashers – modify existing | # intersections | |
| Intersection flashers – remove existing | # intersections | |
| Intersection signing – add basic advance warning | # intersections or # approaches | |
| Intersection signing – add enhanced advance warning (double-up and/or oversize) | # intersections or # approaches | |
| Intersection signing – add enhanced regulatory sign (double-up and/or oversize) | # intersections or # approaches | |
| Intersection signing – miscellaneous/other/unspecified | # intersections or # approaches | |
| Intersection signing – relocate existing regulatory sign | # intersections or # approaches | |
| Intersection traffic control – other | # intersections | |
| Modify control – all-way stop to roundabout | # intersections | |
| Modify control – modifications to roundabout | # intersections | |
| Modify control – no control to roundabout | # intersections | |
| Modify control – no control to two-way stop | # intersections | |
| Modify control – remove right-turn yield | # intersections or # approaches | |
| Modify control – reverse priority of stop condition | # intersections | |
| Modify control – traffic signal to roundabout | # intersections | |
| Modify control – two-way stop to all-way stop | # intersections | |
| Modify control – two-way stop to roundabout | # intersections | |
| Modify control – two-way yield to two-way stop | # intersections | |
| Pavement Markings – add advance signal ahead | # approaches | |
| Pavement markings – add advance stop ahead | # approaches | |
| Pavement markings – add dashed edge line along mainline | # intersections | |
| Pavement markings – add lane use symbols | # approaches | |
| Pavement markings – add stop line | # approaches | |
| Pavement markings – add yield line | # approaches | |
| Pavement markings – miscellaneous/other/unspecified | # intersections or # approaches | |
| Pavement markings – refresh existing pavement markings | # intersections | |
| Modify traffic signal – add additional signal heads | # intersections or # approaches or # signal heads | |
| Modify traffic signal – add backplates | # intersections or # approaches or # signal heads | |
| Modify traffic signal – add backplates with retroreflective borders | # intersections or # approaches or # signal heads | |
| Modify traffic signal – add closed loop system | # intersections or # approaches | |
| Modify traffic signal – add emergency vehicle preemption | # intersections or # approaches | |
| Modify traffic signal – add flashing yellow arrow | # approaches | |
| Modify traffic signal – add long vehicle detection | # intersections or # approaches | |
| Modify traffic signal – add railroad preemption | # intersections or # approaches | |
| Modify traffic signal – add wireless system | # intersections or # approaches | |
| Modify traffic signal – miscellaneous/other/unspecified | # intersections or # approaches | |
| Modify traffic signal – modernization/replacement | # intersections | |
| Modify traffic signal – modify signal mounting (spanwire to mast arm) | # intersections | |
| Modify traffic signal – remove existing signal | # intersections | |
| Modify traffic signal – replace existing indications (incandescent-to-LED and/or 8-to-12 inch dia.) | # approaches or # signal heads | |
| Modify traffic signal timing – left-turn phasing (permissive to protected/permissive) | # intersections or # approaches | |
| Modify traffic signal timing – left-turn phasing (permissive to protected-only) | # intersections or # approaches | |
| Modify traffic signal timing – adjust clearance interval (yellow change and/or all-red) | # intersections or # approaches | |
| Modify traffic signal timing – general retiming | # intersections | |
| Modify traffic signal timing – signal coordination | # intersections or # miles | |
| Systemic improvements – signal-controlled | # intersections | |
| Systemic improvements – stop-controlled | # intersections | |
| Lighting | Continuous roadway lighting | # miles |
| Intersection lighting | # intersections or # approaches | |
| Lighting – other | # miles or # intersections | |
| Site lighting – horizontal curve | # curves | |
| Site lighting – intersection | # intersections | |
| Site lighting – interchange | # interchanges | |
| Site lighting – pedestrian crosswalk | # crosswalks | |
| Miscellaneous | Miscellaneous | # miles or # units |
| Data/traffic records – LRS/GIS | N/A or # units | |
| Data/traffic records – Crash Data Collection | N/A or # units | |
| Data/traffic records – Roadway/Traffic Data Collection | N/A or # units | |
| Data/traffic records – Data Integration | N/A or # units | |
| Data/traffic records – Analysis Tools | N/A or # units | |
| Non-infrastructure – other | N/A or # units | |
| Outreach | N/A or # units | |
| Road safety audits | N/A or # units | |
| SHSP Development | N/A or # units | |
| Training and workforce development | N/A or # units | |
| Transportation safety planning | N/A or # units | |
| Parking | Modify parking | # locations |
| Parking – other | # locations | |
| Remove parking | # locations | |
| Restrict parking | # locations | |
| Truck parking facilities | # locations | |
| Pedestrians and bicyclists | Crosswalk | # locations |
| Install new "smart" crosswalk | # locations | |
| Install new crosswalk | # locations | |
| Install sidewalk | # miles | |
| Medians and pedestrian refuge areas | # miles or # locations | |
| Miscellaneous pedestrians and bicyclists | # miles or # locations | |
| Modify existing crosswalk | # locations | |
| Pedestrian beacons | # locations | |
| Pedestrian bridge | # locations | |
| Pedestrian signal | # locations | |
| Pedestrian signal – audible device | # locations | |
| Pedestrian signal – Pedestrian Hybrid Beacon | # locations | |
| Pedestrian signal – install new at intersection | # intersections or # approaches | |
| Pedestrian signal – install new at non-intersection location | # locations | |
| Pedestrian signal – modify existing | # locations | |
| Pedestrian signal – remove existing | # locations | |
| Pedestrian warning signs – add/modify flashers | # locations | |
| Pedestrian warning signs – overhead | # locations | |
| Railroad grade crossings | Grade separation | # locations |
| Model enforcement activity | N/A or # units | |
| Protective devices | # locations | |
| Railroad grade crossing gates | # locations or # approaches | |
| Railroad grade crossing signing | # locations or # approaches | |
| Railroad grade crossings – other | # locations or # approaches | |
| Surface treatment | # locations or # approaches | |
| Upgrade railroad crossing signal | # locations or # approaches | |
| Widen crossing for additional lane | # locations or # approaches | |
| Roadside | Barrier end treatments (crash cushions, terminals) | # units |
| Barrier transitions | # units | |
| Barrier – cable | # miles | |
| Barrier – concrete | # miles | |
| Barrier- metal | # miles | |
| Barrier – other | # miles or # units | |
| Barrier – removal | # miles | |
| Curb or curb and gutter | # miles | |
| Drainage improvements | # miles or # locations | |
| Fencing | # miles | |
| Removal of roadside objects (trees, poles, etc.) | # miles or # locations or # objects | |
| Roadside grading | # miles | |
| Roadside – other | # miles | |
| Roadway | Install / remove / modify passing zone | # miles or # locations |
| Pavement surface – high friction surface | # locations | |
| Pavement surface – miscellaneous | # miles | |
| Roadway narrowing (road diet, roadway reconfiguration) | # miles | |
| Roadway – other | # miles | |
| Roadway – restripe to revise separation between opposing lanes and/or shoulder widths | # miles | |
| Roadway widening – add lane(s) along segment | # miles | |
| Roadway widening – curve | # curves | |
| Roadway widening – travel lanes | # miles | |
| Rumble strips – center | # miles | |
| Rumble strips – edge or shoulder | # miles | |
| Rumble strips – transverse | # miles | |
| Rumble strips – unspecified or other | # miles | |
| Superelevation / cross slope | # miles or # curves | |
| Roadway delineation | Improve retroreflectivity | # miles or # signs |
| Longitudinal pavement markings – new | # miles | |
| Longitudinal pavement markings – remarking | # miles | |
| Delineators post-mounted or on barrier | # miles | |
| Raised pavement markers | # miles | |
| Roadway delineation – other | # miles | |
| Roadway signs and traffic control | Curve-related warning signs and flashers | # curves or # signs |
| Sign sheeting – upgrade or replacement | # signs | |
| Roadway signs and traffic control – other | # signs | |
| Roadway signs (including post) – new or updated | # signs | |
| Shoulder treatments | Widen shoulder – paved or other | # miles |
| Pave existing shoulders | # miles | |
| Shoulder grading | # miles | |
| Shoulder treatments – other | # miles | |
| Speed management | Modify speed limit | # locations |
| Radar speed signs | # locations or # signs | |
| Speed detection system / truck warning | # locations | |
| Speed management – other | # locations | |
| Traffic calming feature | # locations | |
| Work Zone | Work zone | N/A or # units |