d) Trip Assignment: The planner is working on the last step of the process and has found the following travel time functions for the two existing routes between zones 1 and 4. tt; = 10 +0.02X, in minutes tt2 = 15+ 0.01X, in minutes If the estimated peak flow between the two zones is 2000 vehicles per hour (from Zone 1 to 4), find the expected number of vehicles that will use Route 1 and Route 2 as well as the travel times between Zone 1 and 4 using the all-or-nothing approach and the user-equilibrium approach. d) Trip Assignment: The planner is working on the last step of the process and has found the following travel time functions for the two existing routes between zones 1 and 4. tt; = 10 +0.02X, in minutes tt2 = 15+ 0.01X, in minutes If the estimated peak flow between the two zones is 2000 vehicles per hour (from Zone 1 to 4), find the expected number of vehicles that will use Route 1 and Route 2 as well as the travel times between Zone 1 and 4 using the all-or-nothing approach and the user-equilibrium approach