N°5 – Maintaining car flow rates training – level 1

Look at the car flow rates circulating below.

With no car being able to leave the current traffic circulation, we can establish “traffic flow continuity”.

– As there are no other possibilities all the cars arriving at point C leave by point D
The traffic flow at point C is the same as at point D,
Therefore: q_vC = q_vD

– All the cars arriving at point C split into the two lanes A and E.
The traffic flow at point C = traffic flow at A + traffic flow at E.
Therefore: q_vC = q_vA + q_vE.

– All the cars arriving at point A go through point B.
Therefore: q_vA = q_vB.

– All the cars leaving by point D come from lanes E and B.
Therefore: q_vD = q_vE +q_vB.