I got the new 2018 E400 Wagon specifically with P3 options, which comes with a bunch of driving assistances features that make up the Drive Pilot Suite. I have a 100 miles commute every day and after testing the DrivePilot feature for the last 4 days (day / night), I noticed the following:

1). The DrivePilot systems often get confused with where the lane marking is (it's clearly marked) and will steer to the left and then right and then left before driving straight. It'll do that again after a few minutes. If there is a cop, I may get pulled over because I am driving like someone who is drunk..

2). On a slight bent road, the car often try to turn, say to the left, but understeer and veered to the right. I have to quickly turn the steering wheel further to the left.

3). At night, even when there are cars on your left, right and front, #1 and #2 is even worse.

I know that this is just semi-autonomous and driver intervention is still required. However, the performance of this feature is so bad I rather get just the Distronic option, which is far cheaper.

Thoughts?

My commute is usually packed with traffic jam and semi-smooth driving (45 MPH - 70 MPH). However, I tend to slow down to speed limit (65 MPH) or lower, because I am still learning the Drive Pilot system. Even at 65 Mph or lower, I am still experiencing the ping-pong situation. I can’t go lower than 45 Mph on a freeway, though.

Yes, the lane marking is very clear on the freeway that I drive (CA). I know there are a few patches on the road where the left line marking on the far left lane is not visibility and I anticipated that by taking control of the car. Everywhere else, the marking is super clear.

OTOH, I rented a V90 while I was in Amsterdam and it have the Drive Assistance system, too and I noticed the same problem with my E400. Maybe it’s the system itself?