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Roadside infrastructure can greatly help disseminate data to drivers. In this paper, we study a fundamental problem, i.e., roadside infrastructure planning. We propose a class of algorithms named Tailor to select a minimum number of intersections to install the infrastructure. In the case when the traffic information is not available, we formulate the intersection selection problem, which formally proves its np-completeness, and provide novel heuristics, i.e., the adapted-bipartite-based heuristics (ABS), to solve it, whose worst-case approximation ratio is 4/3. ABS bridges the planar graph and the bipartite graph through topology transformation. With ABS, the approximate solution to all the problems that are NP-hard in a general planar graph but polynomially solvable in a bipartite graph can be efficiently obtained in the planar graph. We also prove that, even with traffic information, the intersection selection problem remains NP-hard. Greedy heuristics is employed to balance the tradeoff between the number of selected intersections and the percentage of reached vehicles. [ABSTRACT FROM PUBLISHER]