Final answer:
Sanitation workers navigating a city need to consider the direction of traffic flow, as indicated by the arrows on a map, and obey these directions to reach their destination legally and safely. In this case, they are moving from Upton Street and need to head towards Grove Street, avoiding floods and one-way streets that go in opposite direction to their intended route.
Step-by-step explanation:
Without being able to view the actual map to provide a precise route, one can still understand that Sanitation Workers McKay and Callihan would have to follow paths based on the direction of traffic flow as indicated by the arrows on the map. If they are currently northbound on Upton Street and need to reach Ross Park on Grove Street, they will need to navigate to Grove Street by obeying the direction of the arrows, which indicate whether streets are one-way or two-way, avoiding flooded routes, and always going with the traffic flow to abide by the law. Unfortunately, without the actual map, a precise route can't be provided.
Learn more about Traffic Navigation