Final answer:
It is generally illegal to make a left turn on a red traffic signal from a one-way street to another in the District of Columbia, as this rule helps manage traffic safety and adherence to posted speed limits.
Step-by-step explanation:
In the District of Columbia, it is generally illegal to make a left turn on a red traffic signal from a one-way street to another one-way street. This rule is in place primarily to manage traffic safely and ensure that vehicles do not speed through intersections, which would not only disregard the posted speed limit but also increase the risk of accidents.
There are exceptions to traffic rules in emergency situations, such as when a pregnant woman is in urgent need of reaching a hospital. However, these are specific circumstances and do not change the general legality or rules of traffic signals.