Since Sunday, Emergency Medical Services paramedics have gone to the aid of four people in separate moped accidents — one fatal, one critical and two serious.

Tuesday’s moped accident, in which a 51-year-old Waianae man died, underscores the dangers associated with mopeds.

“Mopeds are thought to be convenient and inexpensive, but the risks could cost you your life,” EMS spokeswoman Shayne Enright said. “What you planned to be a quick trip from point A to point B could result in a long hospital stay or worse.”

Moped accidents have been averaging two a month on Oahu, with 20 so far this year, totaling 24 injured, according to data gleaned from EMS media reports.

Tuesday’s accident was the first moped fatality this year, compared with four moped fatalities for 2014 and five in 2013, the Honolulu Police Department says. (HPD’s Traffic Division keeps track of critical and fatal accidents but not serious ones.)

Of those 24 injured in 2015, one died, three were critically injured, 16 were seriously injured, two were in stable condition and one declined to be taken to the hospital. They range in age from a 4-year-old boy to a 77-year-old woman.

“For decades, paramedics have treated traumatic injuries caused by moped crashes, and still just today we responded to two separate crashes where both riders weren’t wearing helmets,” Enright said Monday.

EMS recommends wearing full protective gear during every trip on a moped. That includes a helmet, jacket, gloves, long pants and closed-toe shoes.

“At the very least always wear a helmet,” Enright says. “We see mopeds equipped to go faster than they were meant to go. When you lose control and hit the asphalt or pavement and you are not wearing any gear, your body is not designed to sustain that amount of extensive trauma.”

A motorcycle industry professional who asked that his name not be used said moped use is fraught with danger far more than motorcycle use for two reasons: Moped drivers are not required to take a certification course as motorcyclists are; and mopeds often exceed the 35 mph maximum speed allowable by law because they are frequently equipped with after-market parts that allow them to travel up to 50 mph.

Moped operators are required by law to follow the speed limits and must have a driver’s license.

Several of the crashes this year were single-moped crashes. EMS reports say in some cases the moped operator lost control, sometimes striking  a stationary vehicle or a guardrail. Others were hit by a vehicle.

In Tuesday’s 5:38 a.m. crash in Kapolei, the driver was heading east on Farrington Highway when he struck a road curb. He was thrown from the moped and taken in critical condition to the Queen’s Medical Center, where he later died, police said.