GATE Civil Engineering
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The relationship between traffic flow rate (q) and density (D) is shown in the figure 

The shock wave condition is depicted by

  1. flow with respect to point $1\:(q_1=q_{max})$ 
  2. flow changing from point $2$ to point $6\:(q_2>q_6)$
  3. flow changing from point $3$ to point $7\:(q_3<q_7)$
  4. flow with respect to point $4$ and point $5\:(q_4=q_5)$
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