Having cameras at traffic intersections to automatically ticket cars that run red lights might raise revenue for municipalities but does not increase traffic safety.
Conclusion
Having red light cameras might raise revenue for municipalities but doesn't increase traffic safety.
Intermediate Conclusion
Accidents increase at red-light camera intersections.
Evidence
There are fewer side-impact collisions but more rear-impact collisions.
Evaluate
The conclusion might look like a two-pronged claim, 1. red light cameras raise revenue 2. red light cameras don't increase traffic safety
... but it probably doesn't make sense to worry about that first claim. The author only says it might raise revenue, so she's not committing to it, and she doesn't offer any supporting ideas for it.
So let's focus on the second half, which is an Anti-Causal claim. They're saying red light cameras don't increase traffic safety, so we wanna try arguing that they do increase traffic safety.
The author will say,
How can we respond to that, if we're trying to say that red light cameras increased traffic safety?
Maybe we could say, ?
Or maybe we could say even though there are more collisions now, they are somehow safer collisions?
Goal
We need an answer that helps us say that even though there are more collisions than before at these red light camera interactions, the red light cameras have increased traffic safety.