I Learned - Car Light Trails

Because the prompt for Sunday's Scavenger Hunt was head lights I decided to try photographing car light trails in the city last Saturday. So I set up on a covered walk way over a road. I would have liked to try some on ground level but it was raining off and on. And actually there were some drunk people loitering around down there, so no. I used my 55-250mm lens so I could zoom in and out. I used a tripod and set the 2 second timer on my camera so I would minimise camera shake. Even my son jumping around next to me made some movement in some shots. I metered off the sky, and adjusted my shutter speed as it got darker. Photo settings ISO 100, f/22, SS 25 secs. I did take shorter shutter speeds at the beginning as the sun was setting producing shorter trails. There also wasn't as much traffic then. I should have tried some wider apertures as it got darker but it was cold and we had to get our son fed and back home to bed. So something for next time. I liked the city lights but I'd like to set up somewhere darker next time with less distraction from the actual trails, or try some city lights bokeh.
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Constructive critique welcomed

There's been some interest in my settings so I thought I might just explain why I chose these settings. If this is self explanatory just ignore me!
So I started when the sun was just setting and to get the longest shutter speed (= long trails) I set my ISO to 100 (less sensitivity) and aperture to 22 (smaller opening = less light). The added bonus of f/22 is the star bursts, which I wouldn't get at a wider aperture.
When there was still quite a bit of light around my SS was 1.3 secs, I metered off the sky to get the correct exposure. As the cars were only going 60km/hr tops I got really short trails and there wasn't much traffic. As it got darker I kept metering off the sky and adjusting my SS to slower numbers.
Now if I was at a motor way the cars are going really fast so it would be unnecessary to go as slow as 25 secs only a few seconds would probably do.  The longer the SS the more chance of camera shake even on a tripod.
And if I didn't want the star burst I would widen my aperture.
So my settings aren't creatively the correct settings for car trails just what I came up with in my setting to get pleasingly long trails.