Variable | Type | Unit | Description |
CRASHRATE (EX-EN) | Endogenous | Million Vehicle Miles Traveled | Crash count per EX-EN segment taken over AADT and length in miles then multiplied by a million |
CRASRATE (EN-EX) | Million Vehicle Miles Traveled | Crash count per EN-EX segment taken over AADT and length in miles then multiplied by a million | |
TLANES | Exogenous | Number of Lanes | Number of through lanes |
SHOULDER | Feet | Measurement taken from outside lane to edge of pavement | |
MEDIAN | Feet | Measurement taken from insider lane to halfway of opposite direction inside lane edge of pavement | |
AADT | Vehicles per Day | Average annual daily traffic | |
GRADE | Percent | Average grade change for segment | |
RADIUS | Feet | Curve radius | |
LENGTH | Feet | Measurement taken from painted gore of ramp terminal to following painted gore | |
AUX | No Unit - Indicator variable | Present of auxiliary lane |