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Mr. Bruce Westby, PE <br />February 28, 2022 <br />Page 6 <br />Thus, a total of 4 new loop detectors are recommended to be installed with any flashing yellow arrow <br />modifications. No additional 2/014 cables or controller cabinet loop detector cards will be required to <br />operate these new loop detectors since existing loop detectors are already wired separately in each left turn <br />lane. <br />• The height of all overhead signals was also checked during the field review of the intersection to confirm <br />that the distance between each overhead signal (from the bottom of the background shield) to the roadway <br />surface was at least 17 feet. Note that all overhead signal heads are installed such that 2 of the signal <br />indications are mounted below the mast arm mount and 1-3 signal indications are mounted above the mount. <br />From this review, all overhead signals are currently at least 17 feet above the ground line. <br />What this means is that modifying any of the end mounted signals to have 4-section signal heads will not <br />pose a height issue for any of the 4 approaches. <br />• Other minor modifications to the signal system include relocation of EVP detectors and Type D street name <br />signs on the eastbound and westbound facing mast arms to accommodate signal head placements. <br />To allow for flashing yellow arrow operation on each intersection approach, we estimate that these modifications <br />(completed by an electrical signal contractor) will cost approximately $94,000. A detailed preliminary engineer's <br />estimate of costs is attached to this letter for your information. <br />Please review our analysis and feel free to contact me at 651.402.4383 with any questions or concerns that you may <br />have related to our analysis. If you wish to meet to go over these issues, I am available to meet at your convenience. <br />We hope that this information provides you with insight needed to help evaluate and recommend the appropriate signal <br />phasing for this intersection. <br />Sincerely, <br />Short Elliott Hendrickson, Inc. <br />John M. Gray, PE <br />Senior Professional Traffic Engineer <br />