HSM TERMINOLOGY LATEST UPDATE GRADED A+
Approach - ✔✔Lane at an intersection for various movements.
Auxiliary lane - ✔✔Lane marked for use, not assigned for through traffic.
Base model - ✔✔Regression model predicting crash frequency.
Bayesian statistics - ✔✔Inference method using prior knowledge and
likelihood.
85th-percentile speed - ✔✔Speed 85% of motorists drive at or below.
AADT - ✔✔Annual average daily traffic.
Acceleration lane - ✔✔Lane for vehicles to enter traffic.
Acceptable gap - ✔✔Distance to nearest vehicle for turning.
Access management - ✔✔Control of roadway access and design.
Accessible facilities - ✔✔Facilities for persons with disabilities.
Accommodation (visual) - ✔✔Ability to focus inside and outside a vehicle.
All-way stop-controlled - ✔✔Intersection with stop signs on all approaches.
Before-after study - ✔✔Evaluation by comparing crash data before and
after.
Bicycle facility - ✔✔Designated path for bicycle travel.
, Breakaway support - ✔✔Feature allowing support to yield on impact.
Bus lane - ✔✔Lane designated for bus use.
Calibration factor - ✔✔Factor adjusting crash estimates to local conditions.
Channelization - ✔✔Separation of traffic movements.
Clear zone - ✔✔Roadside area for errant vehicles.
Climbing lane - ✔✔Lane for passing slow vehicles on upgrades.
Closing speed - ✔✔Objects' movement based on observed distance.
Coding - ✔✔Organization of information by color and shape.
Collision diagram - ✔✔Schematic of crashes at a site.
Comparison group - ✔✔Untreated sites for before-after studies.
Comparison ratio - ✔✔Ratio of expected crashes before and after.
Condition diagram - ✔✔Drawing of site characteristics.
Conflict-to-crash ratio - ✔✔Ratio of conflicts to crashes observed.
Conspicuity - ✔✔Object's ability to attract road user attention.
Context sensitive design (CSD) - ✔✔Collaborative approach for fitting
transportation facilities.
Continuous variable - ✔✔Variable measured on interval or ratio scale.
Contrast sensitivity - ✔✔Ability to distinguish low-contrast features.
Approach - ✔✔Lane at an intersection for various movements.
Auxiliary lane - ✔✔Lane marked for use, not assigned for through traffic.
Base model - ✔✔Regression model predicting crash frequency.
Bayesian statistics - ✔✔Inference method using prior knowledge and
likelihood.
85th-percentile speed - ✔✔Speed 85% of motorists drive at or below.
AADT - ✔✔Annual average daily traffic.
Acceleration lane - ✔✔Lane for vehicles to enter traffic.
Acceptable gap - ✔✔Distance to nearest vehicle for turning.
Access management - ✔✔Control of roadway access and design.
Accessible facilities - ✔✔Facilities for persons with disabilities.
Accommodation (visual) - ✔✔Ability to focus inside and outside a vehicle.
All-way stop-controlled - ✔✔Intersection with stop signs on all approaches.
Before-after study - ✔✔Evaluation by comparing crash data before and
after.
Bicycle facility - ✔✔Designated path for bicycle travel.
, Breakaway support - ✔✔Feature allowing support to yield on impact.
Bus lane - ✔✔Lane designated for bus use.
Calibration factor - ✔✔Factor adjusting crash estimates to local conditions.
Channelization - ✔✔Separation of traffic movements.
Clear zone - ✔✔Roadside area for errant vehicles.
Climbing lane - ✔✔Lane for passing slow vehicles on upgrades.
Closing speed - ✔✔Objects' movement based on observed distance.
Coding - ✔✔Organization of information by color and shape.
Collision diagram - ✔✔Schematic of crashes at a site.
Comparison group - ✔✔Untreated sites for before-after studies.
Comparison ratio - ✔✔Ratio of expected crashes before and after.
Condition diagram - ✔✔Drawing of site characteristics.
Conflict-to-crash ratio - ✔✔Ratio of conflicts to crashes observed.
Conspicuity - ✔✔Object's ability to attract road user attention.
Context sensitive design (CSD) - ✔✔Collaborative approach for fitting
transportation facilities.
Continuous variable - ✔✔Variable measured on interval or ratio scale.
Contrast sensitivity - ✔✔Ability to distinguish low-contrast features.
