When riding in a car with a long trailer (glider transport trailer) from Poland to Spain and back in ~2002, we quickly found out that LTV truckers would use ind

When riding in a car with a long trailer (glider transport trailer) from Poland to Spain and back in ~2002, we quickly found out that LTV truckers would use indicators to point out when we gained enough distance when overtaking to safely merge back into the lane. Flashing warning lights for thanks is also common in Poland.