The Smart fortwo gets great gas mileage, fits into the tiniest parking spaces and earns style points by looking like nothing else on the road. But you canât help but wonder how the 8-foot, 8-inch micro car will hold up on the mean streets and how occupants will fare if nailed by a Hummer. The Insurance Institute for Highway Safety allayed those fears today by announcing that the 2008 Smart fortwo earned top scores in its crash tests, receiving the highest rating in front-end and side-impact