The two second rule for motorbikes.

Answer to How many people follow the 2-second rule when driving? How often do you see tailgating? by Michael Abbott https://www.quora.com/How-many-people-follow-the-2-second-rule-when-driving-How-often-do-you-see-tailgating/answer/Michael-Abbott-66?ch=99&share=a8d3e48b&srid=XHrmk