Much of the delay in transport networks is caused by incidents. Many indicators are developed to determine vulnerable parts of a network without simulating the network flows with an incident on each of the links. This paper lists indicators proposed in literature and cross compares them. Their values for all links on three networks of different sizes are computed. Among others, the order and the cross correlation of the indicators is compared. For one network the effects are also fully computed, running one simulation per blocked link. Different vulnerability indicators rank the links differently. None of the indicators produces a result similar to the full computation. We conclude that the listed indicators are complementary.