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had the greatest accident rate, 614, and the next highest death rate, 14.8, for every 106,000,000 vehicle miles of travel.
On four-lane highways divided by a wide median, but without the grade separations and other features of controlled-access highways, the accident rate was 203 and the death rate 6.2. The average death and accident rates on rural highways in the period of the study were 9.7 and 348, respectively.
J. P. Mills, Jr., 'Traffic and Planning engineer, said the majority of accidents on:roads where traffic is separated by medians occur at crossovers and; at intersections. He listed excessive speed and driver inattention as the chief causes of such accidents.
In some instances, Mills pointed out, roads had to be four-lane to carry heavy traffic although sufficient right of wa could not be obtained, without, heavy property damage, to provide wide medians, i The report emphasijsed the need for: (1) more miles of controlledaccess highways, (2) construction . of left turns and right turn deceleration lanes on existing fourlane highways with wide medians,, and (3) sufficient ffinds to purchase adequate right of way for wide medians on new projects, especially at intersections.
The accident study was confined to four-lane highways and did not compare the death and accident rates on other types of roads in the state.
Traffic engineers said the study showed that on four-lane highways
59.5%