A silver machine…
Perhaps the observation made in this article: “we found a significant
reduction in the risk of serious injury in silver cars compared with white
cars…silver cars were about 50% less likely to be involved in a crash
resulting in serious injury than white cars…[therefore] increasing the
proportion of silver cars could be an effective passive strategy to reduce
the burden of injury from car crashes,”  can be used to explain this
now rather dated 1970s song lyric:
“I, I just took a ride, in a silver machine
And I'm still feeling mean.
Do you wanna ride, see yourself going by.
The other side of the sky,
I got a silver machine…
I’ve got a silver machine.” 
 S Furness, J Connor, E Robinson, R Norton, S Ameratunga, and R
Jackson, Car colour and risk of car crash injury: population based case
control study, BMJ, Dec 2003; 327: 1455-1456.
 Hawkwind, Song, Silver machine, 1972-3
Competing interests: No competing interests