Question: do booster car seats need to be anchored?
Answer: Simply; if the seat is designed to be anchored, it is unsafe (and illegal) to use it without anchoring. (secured) Child restraints or boosters (with seatbelt) can be used for children over 4 years old. The condition is: if the inbuilt harness is used, then the restraint needs to be secured AND the top tether used.