Figure 2.41 shows the traffic deaths in a particular area before and after stricter enforcement of the speed limit by the police. Does the graph convince you that the efforts of the police have had...

Figure 2.41 shows the traffic deaths in a particular area before and after stricter enforcement of the speed limit by the police. Does the graph convince you that the efforts of the police have had the desired effect of reducing road traffic deaths? If not, why not?