参考范文：
The solutions to the pressing issue of traffic congestions, especially in metropolis, have been a frequent topic of discussion. However, 24/7 free public transport service would not tackle this issue; therefore, other effective measures would be in great need.

Theoretically, providing 24/7 free public transport, like underground and bus, could produce some positive outcomes, among which stands out convenience. This means that commuters could travel by any mode of public transport at any time. Moreover, it is free of charge, irfiich might slightly ease the financial burden on the poor or people of middle class. Certainly, this would attract more public transport users, so the number of private cars may be reduced considerably.

However, this approach would exert more negative outcomes if it is carried out. One main disadvantage is the low-quality public service. By making it free of charge, public transport service would, of course, degrade to a certain degree, since the vehicle will be crowded and even suffocating.. Another problem is that few people would use public transport at late night or in the very early morning; this would be a great waste in terms of public funds. Undoubtedly, people’ s financial burden would be heavier.

To solve traffic gridlock, we need to implement reasonable city road plan. It is true that some traffic jam is caused by inappropriate city road plan and construction. Thanks to high technology, it is also possible to install CCTV to make traffic forecast to drivers. Other strategies could exert significant effects, too, such as controlling and improving signal timing and restricting peak-hour curbside park.
In conclusion, 24/7 free public transport would not be an effective measure to resolve traffic congestion in the long term; hence other strategies need to be implemented at the same time.

拓展词汇：
A pressing issue 一个迫切的问题
解决问题的表达：Address/ tackle/ resolve/ the problem
24/7 service全天24小时，一个星期每天的服务：在英国，可以用
round-the-clock service
执行，实施：carryout; implement
Curbside 路边
CCTV:不是中央电视台的意思，而足指闭路电视