Indicates the composition of the surface of the roadway for use in estimation of friction.
Indicates the composition of the surface of the roadway for use in estimation of friction.
| Name | Type | Required | Description |
|---|
portlandCement | object | Yes | Indicates the surface of the roadway is portland cement. |
| Name | Type | Required | Description |
|---|
asphaltOrTar | object | Yes | Indicates the surface of the roadway is asphalt or tar. |
| Name | Type | Required | Description |
|---|
gravel | object | Yes | Indicates the surface of the roadway is gravel. |
| Name | Type | Required | Description |
|---|
grass | object | Yes | Indicates the surface of the roadway is grass. |
| Name | Type | Required | Description |
|---|
cinders | object | Yes | Indicates the surface of the roadway is cinders. |
| Name | Type | Required | Description |
|---|
rock | object | Yes | Indicates the surface of the roadway is rock. |
| Name | Type | Required | Description |
|---|
ice | object | Yes | Indicates the surface of the roadway is ice. |
| Name | Type | Required | Description |
|---|
snow | object | Yes | Indicates the surface of the roadway is snow. |