What is the minimum amount of blockage that necessitates the use of signs and cones while working in the street?

The correct answer identifies that over half of the street being blocked is significant enough to require the use of signs and cones. The rationale behind this standard is centered on safety and traffic management. Blocking a majority of the street not only affects the flow of vehicular and pedestrian traffic but also poses a higher risk for accidents or confusion among drivers. By using signs and cones, workers can effectively alert drivers about the obstruction, guiding them to alternate routes and ensuring their safety as well as that of pedestrians.

In contrast, when a lesser portion, such as one quarter or one third of the street, may not be deemed overtly disruptive, hence may not require the same level of caution and signage. Blocking all of the street would certainly necessitate signage, but the key threshold for implementing preventive measures effectively is when more than half of the roadway is obstructed, as this greatly impacts transit and requires clear warnings to maintain safety.