One of the biggest pieces of news with PGR4 is the arrival of motorcycles to the lineup of vehicles. Past games have been solely focused on cars, so the arrival of bikes in the game means a whole new set of challenges for the developer. For one thing, bikes handle much differently than automobiles, and this is certainly the case in the game. The extreme acceleration of the bike we tried during GameSpot's hands-on time with the game took some getting used to, as did its extremely twitchy nature while making turns. Second, in addition to taking extreme detail when modeling motorcycles from makers like Ducati and Honda (among others), the team behind PGR4 had to model the riders themselves.