The Straftatbestand (§ 315b StGB) exists for all alterations of traffic. After all, you could conceivably start to manipulate traffic lights [1], remove STOP-signs or erect low-visibility barriers.
reply[1] https://medium.com/asecuritysite-when-bob-met-alice/traffic-...
And this is what would be dangerous. But adding a crosswalk is not, if the law says otherwise it is a bad law.
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