@MLD - You are right that comparing MDBF of a bus to a private car is a fairly meaningless comparison. The problem is that it is the comparison most people seeing the poster will make which is one of the reasons why it is such a poorly designed ad. Since the relevant points of comparison (i.e. what was Metrobus' MDBF the previous year and what is the MDBF of bus' operated by other agencies) are neither provided by the ad nor common knowledge meaning that the vast majority of people viewing the ad will either find it meaningless or make the invalid car comparison (which makes WMATA look bad.)
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