Due to age-related functional declines and changes in mobility patterns, older drivers struggle with complex traffic situations such as intersections. Innovative driver assistance systems could provide support for this group. One assistance approach addresses older drivers’ tendency to process multiple information successively (serially) rather than simultaneously (parallel) by providing prior information about complex traffic situations. Therefore, we evaluated a contact-analogue head-up display informing drivers about the right-of-way regulation and structure of approaching intersections. Using the newly developed Surrogate Complexity Method, we examined the effects of presenting accurate and inaccurate prior information on the accuracy and speed of perceiving traffic situations in 26 older (65–85 years) and 26 younger (25–45 years) drivers. Prior information aided drivers from both age groups in identifying more relevant aspects of the intersections without increasing response time. However, experiencing system failures (inaccurate information) did offset this positive effect for the study’s duration, particularly for older drivers.