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2010 BMW X6 M: Fast and fun--whatever the heck it is

Barreling around the racetrack, there's little lean entering the corners, plenty of thrust on exit and a monster amount of grip everywhere, and if it feels taxed at all, it's ever so briefly as the nose aims left and up from turn five for the steep climb out of the esses. Road Atlanta is plain ol' fast, and the BMW X6 M does well to keep pace, spilling gobs of power all over the track, blazing down the long back straight to nearly 140 mph, maneuvering like no two-and-half-ton pile of metal should. It's exhilarating stuff, to be sure, only we're left asking very many questions, and all of them are: Why?

Lincoln MKX concept revealed ahead of Beijing auto show

Lincoln has pulled the covers off its new MKX crossover concept, which is set for a global debut at the upcoming Beijing auto show. Following on the heels of the MKZ sedan and the 2015 MKC crossover, the redesigned MKX will be the third of four vehicles Lincoln says it will introduce by 2016 (the restyled Navigator doesn't count, apparently). Larger than the compact MKC, the MKX concept wears many of its smaller sibling's styling cues -- from the new split Lincoln grille to the lightly sculpted beltline to the upturned full-width taillights.

Police get tough with Ariel Atom supercar

ANYONE with a taste for speed might fear the sight of flashing blue lights in their mirrors, but nothing could be more frightening than this! British supercar maker Ariel has created this police-specification version of its new Atom 3.5 in order to support the Avon and Somerset Constabulary’s Safer Rider campaign. The Atom PL1 has the same 350bhp supercharged 2.0-litre Honda engine, sequential gearbox and spectacular performance as the regular car – with a 0-60mph time of 2.5 seconds it can match most superbikes – but with the addition of Avon and Somerset Constabulary livery, aerodynamic pursuit lights and safety equipment.