segment of the expressway between Thomson Road and Woodsville Circus, was completed in June 1969 and the segment between Woodsville Circus and Jalan Eunos, named Jalan Kolam Ayer and Paya Lebar Way, was completed by 1970. Work on the long section between Jalan Anak Bukit and Thomson Road began in March 1970. During the construction of this section of the expressway, rocks had to be excavated near Adam Road. Also, Kampong Chantek Bahru, off of Bukit Timah Road, was cleared to make way for the expressway. In January 1975, the section of the expressway between Jalan Eunos and Kallang Bahru was completed, and Jalan Kolam Bahru, between Kallang Bahru and Woodsville Circus, was improved to form a part of the expressway. The section between Adam Road and Jalan Anak Bukit was opened in October 1976 and construction of the eastern part of the PIE, between Jalan Eunos and Changi Airport, started in 1976. Work was started in November 1977 to expand Whitley Road to six lanes, along with the construction of a grade-separated interchange to link it with the PIE. The section of the expressway between Adam Road and Whitley Road was completed by 1978 and was opened to traffic in 1979. Construction from Jalan Anak Bukit to Boon Lay Road was started in 1978. To connect this section to the rest of the PIE, a $15.2 million viaduct over Jalan Anak Bukit and Upper Bukit Timah Road was built. On 10 January 1981, the segment of the PIE between Jalan Eunos and the East Coast Parkway was officially opened by Teh Cheang Wan, the then Minister of National Development, having cost $50 million to construct. The section of the expressway between Upper Bukit Timah and Corporation Road was opened soon after on 31 January 1981 by Lee Yiok Seng, the Parliamentary Secretary of National Development at the time. With the completion of two flyovers across Aljunied Road and Paya Lebar Road in June 1982—three months ahead of schedule—the PIE was fully opened. Impact and expansions Upon its opening, the Pan Island Expressway had a positive impact on traffic flow in certain areas by alleviating traffic, as was reported by a preliminary Public Works Department study in October 1981. From 1983 to 1984, two lanes, one in each direction, were added to the section of the expressway between Mount Pleasant Road and Jalan Boon Lay. By the early 1990s, the