To obtain a traffic marking composition improved in abrasion resis tance.

This coating composition comprises at least one autoxidizable alkoxysilane and at least one binder polymer, wherein the autoxidizable alkoxysilane is represented by the formula: Si(R1)a(R2)b(OR3)4-a-b (R1 is an organic residue comprising at least one of the followings: CH=CH, CH2CH=CH, CH=CH-CH=CH or a dicyclopentenyl group, being bound via a carbon atom to a silicon atom; R2 is an organic residue bound via a carbon atom to a silicon atom; R3 is an organic residue; (a) is an integer of 1-3; (b) is an integer of 0-2; and (a+b) is an integer of 1-3).