BobbyG

Fresh lane marker paint won't stop some people from driving on the shoulder. They may have an actual emergency of some sort, or a medical condition, or maybe they just feel they have an emergency, or they're just selfish jerks. Even a raised curb won't keep a vehicle out of a bike lane or off a sidewalk in the case of an emergency or poor judgement.

HI-vis clothing and lights should help, but are not a panacea.

When riding in familiar surroundings it's easier to learn and remember dangerous stretches of road and unique safety challenges. But when riding new streets in unfamiliar places, staying safe can be bigger challenge.

BTW, Kudos on using a mirror, which I assume in your case is not bar-mounted.