Many public transport services are heavily subsidized. One of the main justifications is the expected beneficial effect on road congestion. Stockholm introduced congestion pricing in 2006 and the effects on car and public transport demand were carefully monitored. The change in prices provides unique estimates on price- and cross-price elasticities. This paper uses these data to model how the optimal pricing, frequency, bus size and number of bus lanes for a corridor depends on the presence of congestion pricing for cars. Results show that the presence of road pricing makes the current subsidies for peak bus trips too high. However, the major welfare benefits of re-optimizing the current bus supply stem from a decrease in frequencies during the off-peak period and the use of larger buses.

许多公共交通服务得到了大力补贴。主要理由之一是对道路拥堵的预期有益影响。斯德哥尔摩于2006年开始实行拥堵收费，并仔细监测了对汽车和公共交通需求的影响。价格的变化提供了对价格和交叉价格弹性的独特估计。本文使用这些数据来建模走廊的最佳定价，频率，公交车大小和公交专用道数量如何取决于汽车拥堵收费的存在。结果表明，道路收费的存在使当前对高峰公交出行的补贴过高。但是，重新优化当前公交车供应的主要福利收益来自于非高峰时段的频率下降和使用更大的公交车。