| Group I | Group II |
| (P) Floating floor | (1) Overflow control |
| (Q) Float valve | (2) Delay not affecting a project |
| (R) Metal float | (3) Acoustical buffer |
| (S) Free float | (4) Plastering equipment |
| (5) Traffic flow control |
A four-arm uncontrolled un-signaled urban intersection of both-way traffic is illustrated in the figure. Vehicles approaching the intersection from the directions A, B, C, and D can move to either left, right, or continue in straight direction. No U-turn is allowed. In the given situation, the maximum number of vehicular crossing conflict points for this intersection is _________ (answer in integer)