Great question, and interesting food for thought.
(Also do check out this thread for the more
advanced version :
click here (Guide: Distinguish Cars More Effectively!))
I think there are many elements that work together :
STYLING
This starts off with the general body-styling or silhouette, and then can eventually focus on the front grille, headlamps, waistline, flared fenders, and even alloy wheel design that give away more information.
All car designers make sure their cars fit the "family style" and have similar elements between them, so as to be recognized as being from the same lineage.
I'd say this is the key one for petrol heads. For eg. if you saw an Aston Martin that you had
never seen before -- you'd still know it was probably an Aston Martin, just by the styling.
The same way as your girlfriend might be able to tell that a certain bag was bought from Burberry and not Gucci.
PREMIUM FEEL?
This might not be the most accurate pointer - but it does play a part.
If you saw a Bentley next to a similarly sized Kia, you'd probably be able to tell which one cost more than a Cr.
Elements like Xenons, bigger wheels, bigger brakes, top quality interior w/ lots of wood + sat-nav etc are pointers to this, and therefore by a process of elimination you can narrow down on what make/s the car is, or is not!
BADGES
Thats cheating. No true petrolhead looks at the badge!
SIZE
This would help more in terms of identifying
models rather than
makes.
If you know the styling says its a merc, and you see the car is as small as a Santro, you'd probably figure it was an A-class.
I'm sure this can be expanded on even further, but thats all i got for now.
How does someone tell the difference between a Picasso and a Hussain?
How does someone taste the difference between a Cadbury and a Hersheys?
How does someone tell if they're listening to the Beegees or the Beatles?
cya
R