Motorcycles have proved fatal to 43 persons already this year, and traffic officials said that the situation will only get worse with the arrival of the rainy season.
Motorcycles are more vulnerable to imperfections in the highway, of which there are many.
The Policía de Tránsito listed oil on the highways, train tracks and open manholes as external dangers to the motorcycle driver.
But they also listed conditions like bad brakes, the lack of required reflective clothing and failure to keep headlights on as problems that motorcyclists caused themselves. The agency noted that operators of motorcycles are supposed to keep lights on all the time to increase visibility.
Motorcyclists and their passengers represented 32 percent of the highway deaths in the first four months of the year, the traffic police said.