expressway was handling considerable traffic but experienced traffic congestion during peak hours. To alleviate this, portions of the PIE, such as the Woodsville interchange and the intersection with the Central Expressway, were upgraded in May 1991 at a cost of $180 million. In addition, service roads were constructed along the expressway near Toa Payoh and at the Woodsville interchange. Work began on an extension of the expressway from Hong Kah Circle to Tuas in October 1991, with a northward realignment and extension of the expressway from Hong Kah Circle to Pioneer Road North. Intended to serve as a connection to the Jurong industrial estate and Jurong West, the extension cost $81.3 million and was opened in December 1993. As the amount of traffic using the KJE and PIE to the Jurong industrial estate increased, the Land Transport Authority upgraded the stretch of the PIE between Tengah Flyover and Tuas Road to a four-lane dual carriageway from the previous three lanes. The work started in March 2004 and was finished in March 2006. Plans to connect the PIE together with Bedok North Avenue 3 were planned since September 2005, with construction began in May 2006 and completed on 29 November 2008, which provides a direct connection from Bedok to the PIE, after complaints over many years. Beginning in July 2011, the stretch of the PIE between Clementi Avenue 6 and Adam Road was widened; one lane was added to both sides of the expressway. As well, the Eng Neo, Chantek and Anak Bukit Flyovers were structurally expanded. The widened portions were progressively opened to traffic from July 2013. List of exits {| class="wikitable" |- ! scope="col" | Exit ! scope="col" | Destinations ! scope="col" | Notes |- | 1 | Changi Airport, East Coast Parkway | |- style="background: #ffdddd" | 1 | Changi South Avenue 3 | Westbound entrance and exit only |- | 2 | Upper Changi Road North/East, Tampines Expressway (SLE), Changi Village and Pasir Ris Town | |- | 3A | Tampines Street 31/Avenue 2 (eastbound) Simei Road (westbound) | Signed as exit 3B eastbound |- style="background: #ffdddd" | 4B | Tampines Avenue 5, Simei Avenue | Signed as exits 4A (Simei Avenue) and 4B (Tampines Avenue 5) eastbound; no westbound exit to Simei Avenue |- | 6 | Bedok North Avenue 3 | |- style="background: #ffdddd" | 8A | Bedok North Road | Westbound entrance and eastbound