帮我用专业的语言改写下面这段话西南地区某高速公路项目总长度76914km投资估算157844亿元资本金占总投资20由政府补助和业主自筹其余80来源于银行贷款以收取车辆通行费方式偿还运营期30年。建设期三年建设期内银行贷款使用比例为30、30、40。

The total length of a certain expressway project in the southwestern region is 76.914km, with an estimated investment of 157.844 billion yuan. The capital contribution accounts for 20% of the total investment, which is funded by government subsidies and the owner's self-raised funds. The remaining 80% is sourced from bank loans, which are repaid through vehicle tolls during a 30-year operation period. The construction period is three years, during which the bank loan utilization ratio is 30%, 30%, and 40%, respectively.