This document discusses the development of routing algorithms for car navigation systems. It covers types of routing including conventional and telematics-based routing. Key challenges are accurately estimating travel time and value of travel time savings. Telematics routing uses real-time traffic and road data from vehicles to improve these estimates. Faster routing algorithms like contraction hierarchies and hub labeling pre-compute supplementary network data to speed up route queries. Future work includes reducing travel time estimates errors and better accounting for individual user preferences.