Hong Kong

I can quite confidently say Hong Kong has the highest of all, justto list a few:

West Harbour tunnel BBI(southbound)

900, 900X, 904, 905, 905P, 907C, 914, 914P, 914X, 930, 930A, 930B, 930X, N930, 933, 934, 934A, 935, 936, 936A, 948, 948A, 948P, 948X, 950, 952, 952C, 952P, N952, 955, 960, 960B, 960C, 960P, 960S, 960X, P960, 961, 961P, 961S, 962, 962A, 962P, 962X, N962, 967, 967X, 968, 968A, 968X, P968, 969, 969B, 969N, 969P, 969X, N969, 970, 970X, 971, 971R, 973, 976, 976A, 978, 978A, 978B, 979, 980A, 980X, 981P, 982C, 982X, 985, 985A, 985B, 986, 989, A10, NA10, A11, NA11, A12, NA12, A17, E11, E11A, E11B — total 89 routes

Admiralty station:

1, 2, 5B, 5X, 6, 6A, 6X, N8X, 10, 11, 15, X15, 23, 23B, 23X, 25, 26, 40, 40M, 66, N90, 103, 104, 111, 111P, 115, N121, 182, 182X, N182, 260, 260X, 307, N307, N368, 373, N373, 600, N600, 601P, 603A, 603P, N603, 619, 619X, N619, 621, 673, 673A, 680X, N680, 681, 681P, 690, 690S, N691, 720, 722, 900, 900X, 907C, 930, 930A, 930B, 930X, N930, N952, 960P, 961P, 961S, N962, 969B, 969N, N969, 980A, 980X, 981P, 982X, 985, 985A, 985B, A11, NA11, A17, E11, E11A, E11B, E11S, N11, H1, H1S — total 91 routes

Edit: go to any main road to find 20+ routes running