My lucky day, others not so much

Today, was obviously one of my lucky days.
I had decided to postpone a trip to West Vancouver till next week, I just went into False Creek and New West instead.
For those who are not familiar with the Vancouver area, West Van only has two ways out by car in reality, and both use the No 1 highway to get to each of the two bridges.
Six people were injured, two of them critically, after a major collision that shut down Highway 1 in West Vancouver Wednesday.
B.C. Emergency Health Services said it dispatched six ambulances and a supervisor to the scene on Upper Levels Highway east of the Cypress Bowl exit around 11:20 a.m.
Six patients were taken to hospital, according to BCEHS. Two of them were in critical condition, two were in serious condition and two were in stable condition.

One ambulance remained at the scene as of 1 p.m.
An image posted on Reddit shows the mangled remains of two vehicles, one that appears to have rolled onto the top of the other.

Other images from the scene show a third damaged vehicle several metres up the road from the crash site.


https://bc.ctvnews.ca/wrong-way-driver-involved-in-crash-that-injured-6-closed-west-vancouver-highway-police-say-1.6078145

Other images from the scene show a third damaged vehicle several metres up the road from the crash site. (CTV)

The West Vancouver Police Department said in a news release that the crash occurred as a result of a motorhome travelling in the wrong direction on the highway.
"Early reports indicate that the driver of the motorhome was travelling westbound in the eastbound lanes when the vehicle caused two other vehicles to swerve before going head-on with the third and final vehicle," police said in the release.
There are reports that the delay shut down the highway for 7 hours.

My question is, how the hell did somebody get on the highway going the wrong way in the first place?

My blip is from West Broadway looking across the city to the North Shore mountains.

Ah well...