求翻译：桥梁的投资额主要由大桥、特大桥来控制的，大桥、特大桥采用近期四车道，单侧预留两车道，可以有效的降低投资额度是什么意思？

Bridge investment mainly by the bridge, Bridge to control the bridge, using the recent four-lane bridge, two lanes reserved for one side, can effectively reduce the amount of investment

The amount of investment mainly bridge by bridge, mega-bridge to control of the bridge, using the recent four-lane bridge, mega-single-side, two-lane reserved, can effectively reduce the amount of investment

The bridge investment cost mainly, the bridge, the especially big bridge which by the bridge, the especially big bridge controls use the short-term four traffic lanes, Shan Ce reserve two traffic lanes, may effective reduce the investment specified amount

Bridges investment mainly controlled by a bridge, the bridge, bridge, the bridge uses the recent four-lane, one-sided reserved two lanes, can effectively reduce the investment quota

Bridges investment mainly controlled by a bridge, the bridge, bridge, the bridge uses the recent four-lane, one-sided reserved two lanes, can effectively reduce the investment quota