Data includes degree of curve, length of curve, percent grade. Intersection - Contains information on highway intersections. Data includes traffic control type, intersection type, signal phasing, and turn lanes. Interchange - Contains information on highway interchanges. Data includes interchange type and ramp characteristics.
Data includes make and model, body style, body type, curb weight, and wheelbase.
Data include guardrail type, post type, rail height, and terminal type. The HSIS contains only police reported accident data on the state-maintained highway system. The size of the state-maintained system depends on the polices of the State and is not necessarily proportional to the size of the State. Data for the original five HSIS States is available from 1985 while data for the three new HSIS States is available from 1991. The following table provides an indication of the quantity of data available.