Measuring driver workload subjectively is a useful way of further understanding the effects of (for example) changing environmental conditions throughout a journey. In a driving simulator study where a participants shall experience multiple 'interventions' within the same homogeneous driving scenario it would be useful to gain a quick understanding of perceived workload for each intervention. For example, drive for 5 minutes under condition X, measure workload for condition X, continue to drive into condition Y, measure workload for condition Y ... etc...
Methods such as a Driver Activity Load Index (DALI) are very useful when participants have time to stop a scenario and engage with this pen-and-paper method directly after each intervention. However, when running multiple interventions back-to-back are there any recommended metrics (non physiology-based) through which one can measure perceived workload through verbal questioning/answering in a time-efficient manner?
Instantaneous Self Assessment (ISA) is a subjective rating scale technique that might fit your purposes well. It was developed back in 1990s for measuring controller workload in ATC simulation studies. Like any subjective measurement technique it has some drawbacks, but it's simple and quite effective. See eg: https://www.skybrary.aero/index.php/Instantaneous_Self_Assessment_(ISA)
Quick Exposure Checklists (QEC) is at method to validate the between researcher and user .this method using scoring table and level of risk exposure between user and task
An older European Union funded project, in which a couple of car and car parts manufacturers had participated, issued a report that lists a couple of methods, including the above mentioned ISI:
http://www.aide-eu.org/pdf/sp2_deliv_new/aide_d2_2_6.pdf
As to validation, I have just found a study in which several driver workload assessment methods have been compared with each other and also with EEG activity during driving:
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.865.431&rep=rep1&type=pdf
I have only skimmed these sources, but maybe you find them worth a closer look.
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