  In this paper we assess the impact of path reservation as an additional
feature in our distributed real-time vehicle guidance protocol BeeJamA. Through
our microscopic simulations we show that na\"{\i}ve reservation of links
without any further measurements is only an improvement in case of complete
market penetration, otherwise it even reduces the performance of our approach
based on real-time link loads. Moreover, we modified the reservation process to
incorporate current travel times and show that this improves the results in our
simulations when at least 40% market penetration is possible.
