Which method of signal support is NOT included in the standard methods?

The method of signal support that is not included in the standard methods is arched supports. Standard methods typically refer to common structures utilized in traffic signal installations, which often include pole supports, truss supports, and monotube supports.

Monotube supports are particularly prevalent for their ease of installation and aesthetic appeal, while pole supports are traditional and widely used for various traffic equipment. Truss supports, on the other hand, provide greater stability and allow for the accommodation of multiple signals or heavier configurations.

Arched supports, while they may be employed in certain specialized applications, do not represent a typical or standardized method for traffic signal support systems. This distinction is applicable because standard practices aim to streamline installation and maintenance, ensuring safety and efficiency in managing traffic signals.