基础建设板块12月16日跌1.39%，北新路桥领跌，主力资金净流出7.4亿元

Group 1 - The infrastructure sector experienced a decline of 1.39% on December 16, with Beixin Road and Bridge leading the drop [1] - The Shanghai Composite Index closed at 3824.81, down 1.11%, while the Shenzhen Component Index closed at 12914.67, down 1.51% [1] - A table detailing the individual stock performance within the infrastructure sector was provided [1] Group 2 - The net outflow of main funds in the infrastructure sector was 740 million yuan, while speculative funds saw a net inflow of 149 million yuan and retail investors had a net inflow of 592 million yuan [2] - A table showing the fund flow for individual stocks in the infrastructure sector was included [2]