Under police you should add traveling. I travel 240 miles a day on I-10 for work and I see more cops traveling with traffic than sitting and hiding.
Under hazard, I feel that it would be helpful to have on inside shoulder or on outside shoulder. Last night I had one on the shoulder on my right and then on my left but I had no way of knowing which one until I was on top of them.
Also with stalled Vehicles can you have a tab for stalls and a Tab for abandoned. Since I do travel the same exact Road everyday 240 miles I see the same vehicles and some days people add them and some days people don't because they've been there for more than one day but they're still hazard.