Processing numerous numbers

Driving from Norwich to Doncaster one warm, sunny afternoon recently, I was struck by the number of bits of numerical information a driver is expected to process simultaneously these days. I have a fairly modest car, with a basic, plug-in satnav, and air conditioning. At one point on my journey, as usual not breaking the speed limit, I found myself looking at all nineteen of these numbers:

15:35
55
80
60
3 × 1000
306
21
013399
¾
2
R3
A17
6.5
A1
5
0:56
16:31
12V
120W

Can you work out what each one of these was telling me? The information given in the opening paragraph may help!

Looking at all this numerical data, I wondered how, say, some Year 6 children would get on trying to crack this? If anyone out there tries this as a problem-solving task with a class, I'd be interested to know how they do!

I'll give the solution in a week or so.