Four people are dead following a crash on Highway 93, approximately 25 kilometers south of Jasper late Wednesday night, and it was one of more than a dozen fatal collisions to unfold on Alberta highways since the long weekend.

RCMP say that a car travelling southbound collided head-on with a motorhome travelling northbound.

The occupants of the car, a 47-year-old man, his 42-year-old wife, and their 15-year-old son died at the scene.

A passenger in the motorhome, a 79-year-old woman, also died. The driver, her husband, was airlifted by STARS to a hospital in Edmonton in serious condition.

The highway was closed for several hours after the crash but reopened to traffic about 4:30 a.m. Thursday.

All victims of the crash are from out of the country, RCMP are working to notify their next-of-kin.

The cause of the crash remains under investigation, although alcohol does not appear to be a factor.

Meanwhile, RCMP throughout Alberta has been dealing with a growing number of fatal collisions.

Since the July long weekend, RCMP have recorded 17 fatal collisions that left 23 people dead.

On Wednesday night, south of Stony Plain, RCMP said a car did not stop at a stop sign, and collided with an SUV – the driver of the car was killed.

Then, on Thursday morning, on Highway 49 and Range Road 244, a gravel truck heading north, and turning west, collided with a semi-truck headed eastbound on the highway.

The semi caught fire, and the driver was found deceased inside after firefighters put it out.

“We see the devastation,” Cpl. Darrin Turnbull with the RCMP Integrated Traffic Unit said. “Then we have to go knock on the doors, and tell them their loved one isn’t coming home.”

Those statistics don’t include fatal collisions in Edmonton, where police have seen two traffic fatalities since the long weekend – in one, a man died after rolling his vehicle from Anthony Henday Drive onto Yellowhead Trail, in the other, a senior was hit by a vehicle in Lewis Estates, after finishing a trip to the grocery store.

In the recent crashes, the causes are still under investigation.

Despite the staggering numbers, officials noted that 2014 statistics are still lower than numbers for 2013 at this time of year.

With files from Dan Grummett and CTV Calgary