Multiple focus groups were presented with various signing and then asked to interpret the signing. They were also asked to decide if they were in a certain travel lane, en route to a certain destination, would a lane change be required.
The key project objective is to better understand driver expectations as they approach complex interchanges based on signing.
Drivers expect that there will be functional relationships between lanes on the roadway and arrows/text on signs, and that the signs will make these relationships clear. Drivers expect that the distance between a guide sign and a "last chance" decision point will be sufficient to allow for making any necessary lane changes in a safe and timely manner. Drivers expect that they will have more than one opportunity to obtain necessary destination and lane information before they need to make a final decision regarding lane choices. Drivers expect that the freeway system—lanes, arrows and text on signs, lane markings, etc.—will provide them with the necessary information to construct a mental model and that it will be sufficient to support timely and accurate decisions about lane choice. Drivers expect that the information available to them through the freeway system will be sufficient to support decisions about lane choices; at the least, they will never have to move over more than one lane at the last moment. Drivers expect that the freeway system will provide sufficient information to support decisions about all route choices, not just frequent or popular choices.