What could indicate a significant delay in traffic due to an incident?

A significant delay in traffic due to an incident can often be indicated by two tracks being affected. When both tracks are compromised, it typically means that train operations in both directions are disrupted, leading to longer waiting times for trains and possibly requiring them to be rerouted or halted altogether. This situation can significantly increase the likelihood of delays as trains cannot traverse the affected section, therefore causing a backlog of rail traffic that could ripple throughout the entire network.

The presence of emergency personnel might suggest an incident has occurred, but it does not provide clear information on the extent of the delay itself. Similarly, while the closure of surrounding roads can indicate an incident's severity, it doesn't directly correlate with the impact on train operations. Increased train schedules typically point toward efforts to maintain service levels or address passenger demand, rather than indicating delays. The situation where two tracks are affected provides a more direct link to significant delays in rail traffic.