Advances in Civil Engineering

Research Article

Proposing New Methods to Estimate the Safety Level in Different Parts of Freeway Interchanges

Table 3

Variable description and their range used for simulation.
VariablesaRange
Weaving areaa
LW (m)300 to 900
NW (#)4 to 5
NR-ON (#)1 to 2
NR-OFF (#)1 to 2
VFW (veh/h)750 to 2970
VR-ON (veh/h)600 to 1600
SFW (km/h)90 to 120
SR-ON (km/h)40 to 60
SR-OFF (km/h)40 to 60
Merge areab
LACC (m)100 to 500
VFW (veh/h)750 to 2970
NFW (#)3 to 4
VR-ON (veh/h)600 to 1600
NR-ON (#)1 to 2
SFW (km/h)90 to 120
SR-ON (km/h)40 to 60
Diverge areac
LDEC (m)100 to 500
NFW (#)3 to 4
NR-OFF (#)1 to 2
VFW (veh/h)750 to 2970
SFW (km/h)90 to 120
SR-OFF (km/h)40 to 60
Rampsd
LR (m)100 to 500
NR (#)1 to 2
SLONG (%)āˆ’3 to 3
VR (veh/h)600 to 2200
RR (m)60 to 140
aLW is the length of the weaving area, NW is the number of lanes in the weaving area, NR-ON is the number of on-ramp lanes, NR-OFF is the number of off-ramp lanes, VFW is the freeway volume, VR-ON is the on-ramp volume, SFW is the freeway free-flow speed, SR-ON is the speed of on-ramp, and SR-OFF is the speed of off-ramp. bLACC is the length of the acceleration lane, VFW is the freeway volume, NFW is the number of freeway lanes, VR-ON is the on-ramp volume, NR-ON is the number of on-ramp lanes, SFW is the freeway free-flow speed, and SR-ON is the speed of on-ramp. cLDEC is the length of the deceleration lane, NFW is the number of freeway lanes, NR-OFF is the number of off-ramp lanes, VFW is the freeway volume, SFW is the freeway free-flow speed, and SR-OFF is the speed of off-ramp. dLR is the length of the interchange ramp, NR is the number of lanes in the interchange ramp, SLONG is the average slope of the ramp, VR is the ramp flow rate, and RR is the radius of the ramp.