Over sized truck loads

On the road from Rio de Janeiro to Macaé (you can't call that road a highway) sometimes you are obliged to keep behind a truck with an over-sized trailer with heavy equipment used in the Oil & Gas business. If the truck & trailer is over-sized the transport is being escorted by one or more cars, signalling the over-sized cargo. If you are behind such a convoy, it can take 10 , 20 or sometimes 30 minute to pass, as the road is still single, and only a few places to overtake.