What command would signal a unit to meet at a specified location?

The command that signals a unit to meet at a specified location is "Meet _ at _." This command provides clear, direct instructions that communicate both the action required (to meet) and the necessary details regarding the location. Utilizing a structure that explicitly specifies the meeting point ensures that all parties involved understand where to assemble, which is crucial in situations that require coordination and quick response.

In scenarios where collaboration is needed, such as during incidents or operations, having a standard command like this helps eliminate confusion and facilitates efficient communication among units. The clarity and simplicity of this command are essential for effective tactical operations, ensuring that all team members are on the same page regarding their rendezvous point.

The other options fall short in providing the necessary clarity for meeting instructions. For example, "Traffic check" pertains to the assessment of vehicular movement rather than a meeting command. "Finished last assignment" indicates completion of a task but does not direct anyone to meet. "Arrived at location" indicates someone's status but does not establish a point for others to gather. Thus, the chosen command is specifically designed to communicate the act of meeting clearly.