Next, let’s analyze the cost of laying cables for two light sources on a three-segment road. The load flow of the traditional street lamp trunk cable on a 3 km road is I=P/U=202*250/220=230A, which requires a cross-sectional area of 60mm2. The unit price of copper core cable is 120 yuan/meter, and the cable cost is 120*3000=360,000 yuan. The load flow of the LED street light trunk cable is 1=P/U=202*50/220=44A, which requires a cross-sectional area It is a copper core cable of 10mm2, which requires a copper core cable with a cross-section of 12mm2, the unit price is 12 yuan/meter, the cable cost is 12*3000=36,000 yuan, and the cable load flow of the traditional street lamp trunk line for 5 kilometers of road I=P/ U=333*250/220=377A, it needs a copper core cable with a cross-section of 90mm2, the unit price is 180 yuan/m, the cable cost is 980*5000=900,000 yuan, and the LED street light trunk cable load flow I=P/ U=333*50/220=73A, it requires a copper core cable with a cross-section of 20mm2, the unit price is 25 yuan/piece, the cable cost is 25*5000 = 125 thousand yuan, and the cable flow rate of the traditional street lamp trunk line for 10 kilometers of road I= P/U=666*250/220=680A, it needs a copper core cable with a cross-section of 400mm2, the unit price is 360 yuan/meter, the cable cost is 360*10000=3.6 million yuan, the LED street light trunk cable load flow I= P/U=666*50/220=146A, it requires a 42mm2 copper core cable with a unit price of 60 yuan/meter and a cost of 600,000 yuan