AMC5 ADR.OPS.B010(a)(2), point (a) defines that the response time is subject to optimum visibility and surface conditions. What circumstances should be considered as optimum visibility and surface conditions?

‘Optimum visibility’ includes daytime and good visibility that is not being interfered by any environmental impacts impairing the driver’s view (e.g. precipitation such as rain, snow, or fog).

‘Optimum surface conditions’ means that the normal response route (i.e. the predefined route that is normally available unless there is a temporary maintenance) can be accessed without delay and is free of any:

• environmental contamination (e.g. no precipitation, water, ice, or snow); or
• unusual or unpredictable obstacles affecting safety and effective response time (e.g. foreign object debris (FOD), traffic obstructing RFFS routing, etc.).