reason seems to be that it may be harder for the vehicle going up to get started again. At least in California, it is also the vehicle going downhill that must back up, if it is too late to stop at a wide spot. Types Chicanes Chicanes are often placed on residential streets as a more aesthetic means to slow down cars. One-lane passages Sometimes, for budget reasons, and where traffic is fairly low, bridges exist as single-track corridors. Tunnels in remote areas can also be one lane when the tunnel is short and traffic is low, when building a hill or blasting away the mountain is too cost-prohibitive. One-way single-track roads Single-track roads also exist as one-way stretches. Exit and entrance ramps for freeways and motorways are among common examples of one-way single-track roads. Private single-track roads The most common example of private single-track roads are long driveways of rural properties such as country houses and farm property. Ice roads The mountain passes on the Dalton Highway in Alaska have a rule where goods-carrying northbound truck traffic has the right of way, while returning southbound traffic has to stop, as mentioned on Ice Road Truckers. The reason behind this procedure is that traffic going north is in somewhat of a hurry to deliver equipment to Deadhorse, Prudhoe Bay, and the drill site over the frozen Arctic Ocean. Temporary one-lane restrictions When reconstruction is being done on two-lane highways where traffic is moderately heavy, a worker will often stand at each end of the construction zone, holding a sign with "SLOW" or "GO" written on one side and "STOP" on the reverse. The workers, who communicate through yelling, hand gestures, or radio, will periodically reverse their signs to allow time for traffic to flow in each direction. A modification of this for roadways that have heavier traffic volumes is to maintain one direction on the existing roadway, and detour the other, thus not requiring the use of flaggers. An example of this is the M-89 reconstruction project in Plainwell, MI, where westbound traffic is detoured via county roads around town. User etiquette If lines of sight are long, and both drivers are familiar with the road, vehicles heading towards each other can adjust their speed so as to arrive at a wide spot at the same time and pass slowly, avoiding the need for either vehicle to stop. When two