Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
A road has four intersections. At the first intersection, there are 40 road signs showing different types of information mounted on the street poles. At the second intersection, 1/4 times more road signs than the first intersection are mounted on the street poles. The number of road signs at the third intersection is twice the number at the second intersection. If at the fourth intersection the number of road signs is 20 fewer than those at the third intersection, calculate the total number of road signs at the four intersections.

### Response:
 Ikiwa kuna alama za barabarani 40 katika makutano ya kwanza, makutano ya pili yana alama za barabarani 1/4 * 40 = <<40*1/4=10>>10 zaidi.
Idadi jumla ya alama za barabarani katika makutano ya pili ni 40 alama za barabarani + 10 alama za barabarani = <<40+10=50>>50 alama za barabarani.
Makutano ya tatu yana alama za barabarani mara mbili ya idadi ya makutano ya pili, jumla ya alama za barabarani ni 2*50 alama za barabarani = <<2*50=100>>100 alama za barabarani.
Makutano ya nne yana alama za barabarani 20 chini ya makutano ya tatu, maana yake kuna alama za barabarani 100 alama za barabarani - 20 alama za barabarani = <<100-20=80>>80 alama za barabarani.
Jumla ya alama za barabarani katika makutano manne ni 80 alama za barabarani + 100 alama za barabarani + 50 alama za barabarani + 40 alama za barabarani = <<80+100+50+40=270>>270 alama za barabarani.