Passage Summary: The city plans to charge drivers but needs a high-tech camera system to catch cheaters. Because the cameras won't be ready for a while, the author concludes the start of the program will be plagued by unenforced rules.

Conclusion: The mayor's congestion charge will not be effectively enforced when it is first implemented.

Reasoning: Effective enforcement requires a sophisticated camera system that will not be ready until the end of next year, and without it, mass evasion will occur.

Analysis: The author is assuming a specific timeline: that the 'first implementation' will happen before the camera system is ready. If the mayor decides to wait until the cameras are fully functional before starting the program, then the very first implementation *would* be effectively enforced. Therefore, the argument relies on the assumption that the mayor won't delay the start of the plan until the technology is ready. Look for an answer that connects the start date of the plan to a time before the camera system is operational.