VISSIM 5.30-05 User Manual

6 The Traffic Network
● Front Gap (only for crossing
conflicts): Minimum gap in
seconds between the rear end
of a vehicle on the main road
and the front end of a vehicle
on the minor road, i.e. the
proposed time elapsed since
the vehicle with right of way
has left the conflict area before
the yielding vehicle enters it.
For each vehicle class, a
separate gap can be entered.
● Rear Gap (only for crossing
conflicts): Minimum gap in
seconds between the rear end
of a vehicle on the minor road
and the front end of a vehicle
on the main road, i.e. the time
that a yielding vehicle must
provide after it has left the
conflict area before a vehicle
with right of way enters the
conflict area. For each vehicle
class, a separate gap can be
entered.
This illustration shows the current and the
"planning ahead" situation ("ghost cars")
when the car on main road just left the
conflict area. Then the front gap is evaluated
as the time needed for the vehicle on the
minor road to reach the conflict area (here:
0.5s)
This illustration shows the current and the
"planning ahead" situation ("ghost cars")
when the car on main road just reached the
conflict area.Then the rear gap is evaluated
as the time elapsed since the vehicle on the
minor road left the conflict area (here: 0.7s)
274 VISSIM 5.30-05 © PTV AG 2011