organizations evolving to set standards and rules for different classes of competition. Technological innovation brought much higher speeds in all scales, with faster motors, better tires, and traction magnets to hold the cars down in curves, though some of the 1960s enthusiasts thought that slot racing had become too specialized for the casual hobbyist, and fondly remembered the more primitive cars of their youth as not so fast, but more fun. In the 1990s, computer design and methods of printing on 3-D objects helped create much more detailed and authentic models than the simple shapes and rudimentary graphics of the slot car boom. In addition, newly manufactured replicas of Aurora's HO slot cars of the 1960s and 1970s appeared on the market and consumers gained the option of racing either the modern high-tech wondercars or the more basic designs of an earlier time. In 2004, the Digital Command Control (DCC) systems, which had revolutionized model railroading in the 1990s, began to appear in 1:32 slot cars, offering the ability to race multiple cars per lane with more realistic passing. In 2012, Hong Kong Chinese inventor Mak Wing Kwong introduced the "Dynamic Motion Express" slot car system. The DMX track has a series of parallel slots, allowing drivers to choose lanes on the inside, middle or outside of the raceway, passing or blocking other racers. DMXslot cars have a rotating mechanism underneath each car with four pins that retract and protrude as the driver commands the car to move left or right. The car disengages its pin with one lane’s slot, moves to one side or the other, and reinserts a pin in the new lane’s slot. Related systems and developments A number of technological developments have been tried over the years to overcome the traditional slot car's limitations. Most lasted only a few years, and are now merely historical curiosities. Around 1962, AMT's Turnpike system (USA) used multiple electrical pickups within the slot to allow drivers to control, to a limited extent, the steering of special 1:25 cars. In the late 1960s the Arnold Minimobil system (Germany), also marketed as the Matchbox Motorway (UK), used a long hidden coil, powered by track-side motors, to move die-cast or plastic cars down the track via a slot and detachable pin. Cars in different lanes could race, but cars in the same lane moved at the same speed, separated by a fixed distance.