don't cross
Don't cross this line.
Por favor, no cruces esta línea.
Please, do not cross this line.
No cruces nunca la calle sin haber mirado que no pasen coches.
Never cross the street without checking that no cars are coming.
Don't cross this bridge.
No cruces la carretera cuando el hombrecito verde esté parpadeando.
Don't cross the road when the little green man is flashing.