Rear-end collisions are the most frequent type of collision on toll roads in some countries. The potential risks of rear-end collisions were drivers, vehicles, roads, and the environment. In Indonesia, rear-end collisions frequently occur on the Jakarta-Bogor-Ciawi (Jagorawi), Cikampek-Purwakarta-Padalarang (Cipularang) and Cikopo-Palimanan (Cipali) toll roads. Few previous studies have focused on risky driving behavior phenomena in Indonesia on rear-end collision risks. This study aims to explore the risks of rear-end collisions on Indonesian toll roads especially risky driving behavior. This study conducted a structured interview with 20 drivers and used voice call WhatsApp application. The results showed that the rank (high-low) of rear-end collision risks based on participants’ perception were driver, road, environment, and vehicle.  Data show that 70% of participants choose to increase their speed to overtake the truck when it is directly in front of their vehicle. In other circumstances, 55% of participants drive at the same speed in a situation where the bus is the lead vehicle. It also happened in 90% of participants facing a passenger vehicle as the lead vehicle. In addition, the interview result show Cipali and Cipularang toll road sections have a high risk for rear-end collisions.