Two tasks at once: driving and arithmetic, dual tracking, sorting and counting — free
These games all make the same uncomfortable point. For two tasks that both need attention, humans do not genuinely work in parallel — we alternate, and every switch costs something. What these games measure is the size of your switching cost, and it is usually larger than people expect.
Drive Safe pairs steering between lanes with arithmetic below the road. Both are easy alone; together, the maths collapses first because it is the task you are willing to drop.
Dual Tracker splits visual attention across two separate zones, which is harder than tracking two objects in one field because you cannot cover both with a single gaze.
Memory Reaction pairs holding something with responding quickly, so every reaction is a gap in the rehearsal that was protecting your memory.
Sort & Count pairs categorising with keeping a running total, and the count is what almost everyone loses.
Traffic Control and Multiple Stimuli round out the set with routing and with two-channel sequences.
Genuine parallel processing of two attention-demanding tasks is essentially not something people do. What looks like multitasking is rapid alternation, and the reconfiguration between tasks takes real time.
What improves with practice is the speed of the switch, and, eventually, making one task automatic enough to need no attention at all. That second route is how experienced drivers hold a conversation — the driving has become automatic, not parallel.
This is also why phone use while driving is dangerous in a way hands-free does not fix: the cost is attentional, not manual. Drive Safe demonstrates that in about sixty seconds.
Sequence deliberately rather than trying to be parallel. Do the secondary task in the gaps the primary one leaves.
Decide in advance which task you will drop under pressure, and drop it cleanly rather than degrading both.
Chunk and pre-process. In Sort & Count, counting physically rather than verbally removes the conflict entirely.
Protect the fragile task. Reactions are recoverable; a dropped count or a dropped memory is not.
For two tasks that both require attention, essentially no. We alternate rapidly and the switch costs time. What improves with practice is the switch speed, or making one task automatic.
The extra time and error that come from reconfiguring between two tasks. It is measurable, consistent, and larger than most people assume.
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Drive Safe illustrates why divided attention is dangerous. It is not a driving assessment and should not be treated as one.