Maning Sambale

@Rub21 thanks for the hint! > https://github.com/osmlab/osmlint/blob/master/validators/crossingHighways/map.js#L156-L174 Can you explain what ^^ line do?

Tried again, I get an output but process did not finish. Same issue as above. However, the output doesn't seem to be overlapping highways. See https://gist.github.com/maning/3f421f7bf1d07c47e36affc5d7637501

Lol, [yes](https://taginfo.openstreetmap.org/keys/id#combinations). But it looks like a rare case for `highway`. 

@geohacker @Rub21

@Rub21, for example, in this [building shape analysis repo](https://github.com/mapbox/osm-building-shapes) we calculate [polygon area](https://github.com/mapbox/osm-building-shapes/blob/master/map.js#L28) in one of the metrics. Any polygon we detect that has negative numbers is an invalid polygon....

@geohacker @Rub21 @arunasank Can we do this? Context here: https://github.com/osmlab/labuildings/issues/92#issuecomment-222731623