No.

Road parameters

Accident Modification Factors (AMF)

Where

1

Lane Width

AMF 1 r = ( AMFra 1 ) Pra + 1

AMFra = AMF of related accidents, Pra = proportion of related accidents, w & t indicate width & types of shoulder respectively

2

Shoulder Width

AMF 2 r = ( AMFwra AMFtra 1 ) Pra + 1

3

Horizontal Curves (HC)

AMF 3 = 1.55 L c + 80.2 R 0.012 S * 1.55 L c

Lc = HC length (mi),

S = spiral curve and

R = HC radius (ft)

4

Super elevation

AMF4 = 1 .00 for SV < 0.0 1 ;

AMF4 = 1.00 + 6 ( SV 0.0 1 ) for 0.0 1 SV < 0.0 2 ;

AMF4 = 1.06 + 3 ( SV 0.0 2 ) for SV 0.0 2

SV = super elevation variation (m/m)

5

Grades

G ≤ 3%, AMF5 = 1.00; 3% < G ≤ 6%, AMF5 = 1.10; and G > 6%, AMF5 = 1.16

G = grade of the road

6

Driveway Density

AMF 6 = 0.322 + DD ( 0.05 0.005 ln ( AADT ) ) 0.322 + 5 ( 0.05 0.005 ln ( AADT ) )

DD = driveway density

7

Roadside Design

AMF7 = exp ( 0.6869 + 0.0668 RHR ) exp ( 0 .4865 )

RHR = road hazard rating

8

Passing Lanes

AMF8 for short four-lane sections = 0.65

AMF8 applied only for short four-lane section