Fast L2 Calibration for Inexact Highway Traffic Flow Systems
Okan Gurbuz
Round 1
Reviewer 1 Report
This paper proposes a fast L 2 calibration framework for an inexact traffic flow model, Greenshields. The topic is interesting, and the paper is well-written. I have some questions about the paper, please see the following comments.
1. What are x_i and y_i in equation 2?
2. What is k in equation 4?
3. Page 7, line 206, typo: “table 2”.
4. Is the speed in figure 3 the average of the whole loop of M25?
5. From the results shown in figure 2, LS seems to be very efficient, which could make it real-time applicable (maybe to solve the periodicity problem). Is there any way that L2’s speed can be further improved?
Author Response
Dear Editor:
Please see the attachment.
Special thanks to you for your good comments!
Author Response File: 
Author Response.pdf
Reviewer 2 Report
This is an interesting study to develop a calibration framework for the inexact traffic flow system. With this approach the computational time reduces with accurate results. Below are some of my suggestions to improve the paper:
1. Ln 53: needs more background and literature about the L2 calibration method by adding other studies referring the benefits of the method.
2. Ln 189: the busiest motorway in the UK sentence should be supported with numbers or references
3. Ln 199: Figure 2 does not have the locations of loop detectors
4. Ln 201: Not both figures highlight the density and vehicle speed correlation, it is only Figure 3.
5. Ln 201: what authors meant by physical observations? did they collect data in the field?
6. Figure 2: needs to add loop detectors, scale, north arrow and with the loop detectors a legend.
7. Ln 206: needs to be Table 1
8. the comparison of the models need to be expanded. It would be better to show how accurate the findings of the new approach.
Author Response
Dear Editor:
Please see the attachment.
Special thanks to you for your good comments!
Author Response File: Author Response.pdf
