places for carriage rides. Two other scenic drives cross the park horizontally. Terrace Drive is at 72nd Street and connects West and East Drives, passing over Bethesda Terrace and Fountain. The 102nd Street Crossing, further north near the street of the same name, is a former carriage drive connecting West and East Drives. Modifications and closures In Central Park's earliest years, the speed limits were set at for carriages and for horses, which were later raised to and respectively. Commercial vehicles and buses were banned from the park. Automobiles became more common in Central Park during the 1900s and 1910s, and they often broke the speed limits, resulting in crashes. To increase safety, the gravel roads were paved in 1912, and the carriage speed limit was raised to two years later. With the proliferation of cars among the middle class in the 1920s, traffic increased on the drives, to as many as eight thousand cars per hour in 1929. The roads were still dangerous; in the first ten months of 1929, eight people were killed and 249 were injured in 338 separate collisions. In November 1929, the scenic drives were converted from two-way traffic to unidirectional traffic. Further improvements were made in 1932 when forty-two traffic lights were installed along the scenic drives, and the speed limit was lowered to . The signals were coordinated so that drivers could go through all of the green lights if they maintained a steady speed of . The drives were experimentally closed to automotive traffic on weekends beginning in 1967, for exclusive use by pedestrians and bicyclists. In subsequent years, the scenic drives were closed to automotive traffic for most of the day during the summer. By 1979, the drives were only open during rush hours and late evenings during the summer. Legislation was proposed in October 2014 to conduct a study to make the park car-free in summer 2015. In 2015, Mayor Bill de Blasio announced the permanent closure of West and East Drives north of 72nd Street to vehicular traffic as it was proven that closing the roads did not adversely impact traffic. After most of the Central Park loop drives were closed to vehicular traffic, the city performed a follow-up study. The city found that West Drive was open for two hours during the morning rush period and was used by an average of 1,050 vehicles a day, while East