ERP car park system has two integrated systems into it...
One is the IU reader connected to a main computer for reading and
detection of IU units in the vehicles and Cashcard IC chip,
computation and data logging of entry time, IU serial number,
Cashcard value, exit time, amount deducted...
Another system is the auto-barrier system... The motor or actuator
of the barrier will only activate upon a pulse signal sent to the
controller from the main computer which will then raise the
barrier...
At the sametime, there will be an active IR sensor mounted which
will send the IR beam, if the beam does not hit obstacle or
obstruction based on a pre-programmed range of timing, the IC on
the controller card will send a pulse signal to activate the
barrier to lower...
However, in these sensor based barrier systems, the IR sensors are
often mounted at an angle to offset and compensate for the time to
tigger the barrier to lower... In layman's term, it means that as
long as the sensor detects obstacle or obstruction, it will not
close till the obstacle or obstruction is cleared... Normally the
offset angle is around 5 to 10 degrees... Enough for a second
vehicle to tailgate close enough, but without kissing the bumper of
the car in front, to "bypass" the barrier system...
So in this scenario of the Rav4 driver, probably she knows this
loophole and thus making it to her convenience...
