Question 4 (a) In your own words, list and discuss the 3 means by which accident locations can be ranked for further investigation, commenting on their advantages and disadvantages over each other. [10 Marks] (b) Draw a space time diagram for traffic within a tunnel. Assuming there exist a 2-lane before the tunnel but the tunnel itself is 1-lane and after the tunnel the road returns to being a 2-lane. [10 Marks] Question 4 (a) In your own words, list and discuss the 3 means by which accident locations can be ranked for further investigation, commenting on their advantages and disadvantages over each other. [10 Marks] (b) Draw a space time diagram for traffic within a tunnel. Assuming there exist a 2-lane before the tunnel but the tunnel itself is 1-lane and after the tunnel the road returns to being a 2-lane. [10 Marks]