# Highway1

##### Highway Accidents

The data comes from a unpublished master's paper by Carl Hoffstedt. They relate the automobile accident rate,
in accidents per million vehicle miles to several potential terms. The data include 39 sections of large
highways in the state of Minnesota in 1973. The goal of this analysis was to understand the impact
of design variables, `Acpts`

, `Slim`

, `Sig`

, and `Shld`

that are under the control of
the highway department, on accidents.

- Keywords
- datasets

##### Usage

`Highway1`

##### Format

This data frame contains the following columns:

- rate
1973 accident rate per million vehicle miles

- len
length of the

`Highway1`

segment in miles- adt
average daily traffic count in thousands

- trks
truck volume as a percent of the total volume

- sigs1
(number of signalized interchanges per mile times len + 1)/len, the number of signals per mile of roadway, adjusted to have no zero values.

- slim
speed limit in 1973

- shld
width in feet of outer shoulder on the roadway

- lane
total number of lanes of traffic

- acpt
number of access points per mile

- itg
number of freeway-type interchanges per mile

- lwid
lane width, in feet

- htype
An indicator of the type of roadway or the source of funding for the road, either MC, FAI, PA, or MA

##### References

Fox, J. and Weisberg, S. (2011) *An R Companion to Applied
Regression*, Second Edition, Sage.

Weisberg, S. (2014) *Applied Linear Regression*, Fourth Edition, Wiley, Section 7.2.

*Documentation reproduced from package car, version 2.1-6, License: GPL (>= 2)*