a). Lower Airspace Radar Service:
Although many ATSUs can provide RAS/RIS, those whose location makes them particularly suitable for providing radar service to transit traffic, at and below FL 95, participate in a system called the Lower Airspace Radar Service (LARS). Details are in AIC 2/2001, (Yellow 33) Services to Aircraft Outside Controlled Airspace and in the UK AIP ENR 1–6–4, latest chart of coverage shown in 6–1–6–3. The service is mostly available weekdays 0800 to 1700 local.