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AASHO accident rates analysis Appendix auto driver trips average beds braking capitol central business district Connecticut Turnpike correlation curve distribution effect Engineering factors Figure Figure Figure ﬁgures ﬁlm ﬁndings ﬁrst friction coefficient friction trailer gas pedal glare headway Highway Research illumination increase indicated inﬂuence institutions Interstate Interstate Highways lighting levels mean measured ment miles motorist nighttime number of studs on-ramp parking passenger patrol pavement wear peak percent percentage photometer protrusion questionnaire Ramp reduced lighting reﬂect rest areas roadbed width roadway rural roads sample shows signiﬁcant skid snow tires speciﬁc speed standard deviation stopping distance studded tires surface taxi tion total person trips traffic traﬂic transit trips Transportation Study TRAVEL MODE trip distribution trip purpose trip rates tripmaking truck Turnpike University urban area values variables velocity volume wheel York State Thruway zones