Which marking tool is used for marking the roadway?

The correct choice for marking the roadway is chalk. This tool is commonly used by law enforcement officers during traffic crash investigations to temporarily mark positions, evidence, or measurements on the road surface. Chalk is readily available, easy to use, and can be easily washed away or erased as needed, making it suitable for temporary markings that help in reconstructing the scene of a traffic collision without causing any lasting damage to the roadway.

In contrast, paint is typically more permanent and may be used for more long-term markings or on surfaces where durability is required, making it less ideal for temporary road markings during an investigation. Pencil and crayon are not practical for marking roadways due to their lack of visibility on a surface like asphalt or concrete, as well as their tendency to wear off quickly, thus making them unsuitable for this specific purpose.