Perhaps part of the problem is that my car is painted tawny, which is a colour that nearly disappears into the background. The biggest problem in traffic is the lack of height; the Europa just doesn't show up in a cursory glance in the mirror of many cars, and pretty much any SUV/pick-up, especially those operated by the average (read; un-engaged, self-absorbed) driver, whilst a motorcycle and rider will have enough height to at least make an appearance in the mirror.
When it comes to rural driving, where you can easily be seen by any driver looking before pulling out into the road, I think the overall small size of the Europa is the main culprit. I can't be certain about this, but incidents of drivers pulling out right in front of me, after stopping at a stop sign and looking for traffic, are significantly more frequent in the Europa than on a motorcycle. It happens so often (and I always drive with the headlights on) that I have had many opportunities to observe and consider why this happens. As near as I can determine, the small size of the Europa on the open road makes it appear as though it is much farther away than it actually is when observed casually, and drivers therefore think they have plenty of time to pull out. Again, the tawny colour probably doesn't help. And just like a motorcycle rider who is a keen defensive driver, you can usually anticipate when someone is going to pull out in front of you before they show any sign that they will. Diligence in defensive driving is a must.