Advantages of a system like this are that they are fairly inexpensive to integrate into existing traffic signals and the ability to use siren equipment already installed in emergency vehicles – thus dispensing with the need for special equipment. A major disadvantage is that sound waves can easily be reflected by buildings or other large vehicles present at or near an intersection, causing the "reflected" wave to trigger a preemption event in the wrong direction. Reflected waves can also create unnecessary collateral preemption events alongside streets near the emergency vehicle's route.
The advantages of this system are its low cost integration into existing traffic signals and the use of sirens already installed in emergency vehicles, which avoids the need for additional equipment. However, a major disadvantage is that sound waves can be reflected by buildings or other large vehicles at intersections, leading to incorrect preemption events. Additionally, these reflections can cause unnecessary preemption events along nearby streets.