Question: West Ridge and the ridge that has IndependenceAvenue/Liberation Avenue as its eastern boundary are separated by what road? 

Related documents: [0]  [DOC] North Ridge is a neighborhood in the city of Accra, Ghana bounded to the south by Castle Road. The Kanda highway serves as the district's western boundary, while the Independence Avenue/Liberation Avenue is the eastern boundary. The Ring road separates North Ridge from the northern district of Kanda. The headquarters of the Bureau of National Investigations is located in North Ridge. Originally planned as a neighborhood for civil servants and businessmen in the colonial era, North Ridge remains one of the better residential neighborhoods in Accra. [END] 
[1]  [DOC] West Ridge is a neighborhood of Accra, Ghana bounded to the south by Kinbu Gardens. Barnes Road serves as the neighborhood's western boundary, while the Independence Avenue/Liberation Avenue is the eastern boundary. Castle Road separates West Ridge from the northern neighborhood of North Ridge. The Accra branch of the British Council is located in West Ridge off Liberia Road. [END]  
Answer: Castle Road
Castle Road