What types of materials are used to build roads?

Material is used in road is GSB,WMM,DBM,Bitumen concrete, Etc

In generally:

Asphalt

Concrete

Gravel

In embankment generally A1, A2, A4 and A3( In confined area) maerial is used

Sub grade or Road Foundation: It is mostly processed material and follow the project spec requirement. A1-a and A1-b is used generally and with minCBR value set by according to local material requirements.

Sub base: process material and meet the project spec requirements

Aggregate Base course: Generally size range from2 inch to1inch depeneding the design. Its blended material to follow the spec requirement.

asphalt aggregate base course: depened on road design to use or not. asphalt is binding material.Generally for heavy load is used. Desing by marchal or superpave method

Weaing course or top course: designed by marshal or super pave. asphalt of different grade or viscosity is used.

Material is used in road is stone, sand, clay, silt,asphalt, concrete etc

Thanks  Ksenija Kancelak for invitation, and sorry the question is not related to my field, hope the experts of this field will answer.