What should you do if you see this sign on the side of the highway?

Despite its simplicity, the modified W4-2 solution seems incomplete. It is unclear, for instance, what the dashed line indicates — is it a separator that divides two lanes or the path of the car? If the dashes represent a lane division, then the ending lane is rendered comically narrow. If instead the dashes represent the vehicular path that is coming to an end, the W4-2 diverges from other W4-series signs (e.g. W4-3 and W4-6) in which dashed lines signify lane separations.

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