Accessibility refers to how easily adjacent land uses can be reached from a roadway. Roads with more intersections, driveways, and direct access points have higher accessibility. Using this:
1. Local Street (S) → Highest accessibility (direct access to homes, shops).
2. Collector Road (R) → Collects traffic from local streets, moderate accessibility.
3. Arterial Road (P) → Limited direct access, mainly for movement.
4. Expressway (Q) → Controlled access, no direct entry → lowest accessibility.
Thus, in descending order of accessibility:
\[
S > R > P > Q.
\]
Final Answer: (B) S-R-P-Q