I did boost the gamma a little too much., original renders have deeper contrast but I was trying to compensate for the darkening of images on the 'net. I do however, like the desaturated feel of the colours, if you observe motorway footage it's probably even more washed out due to glare and atmospherics. I think it's natural to want to correct this.
I added the rain for clip two but haven't yet added all the associated effects including wipers, wet roads, spray & haze. The healights are supposed to flash/full beam too.
The shadow under that truck does seem to be absent...maybe a result of the gamma adjustments and acute angle as there isn't any reason for it really.
The sky is absent from the reflection, rooky error on the render options for the skydome.
LukeC, great to see your highway animation...maybe some stills for inspiration...cheers.
Anyway, thanks all for your helpful input. I'll plough on with it.