In-Car Infotainment Glance-Time Simulator

Infotainment Task

Vehicle speed 60 km/h

Task complexity (taps) 3 steps

Touch target size 44 pt

Voice-first interaction (Siri / Google Assistant)

Live Readouts

Last glance

0.00 s

Blind distance

0.0 m

Gap to vehicle ahead

— m

Cumulative eyes-off-road 0.00 / 12.0 s

Press Start Task

How it works

Every tap on a CarPlay / Android Auto screen forces a driver to glance away from the road. NHTSA's driver-distraction guidelines set two hard limits for any in-vehicle interface: a single glance ≤ 2.0 s, and a cumulative eyes-off-road time ≤ 12.0 s to complete one task while driving.

Each glance's length is modelled with Fitts's Law (Shannon form), which predicts how long it takes to acquire a target of width W at reach distance D:

ID = log2(D / W + 1)
T  = a + b · ID        (a = 0.10 s, b = 0.15 s, D = 300 mm)

Smaller touch targets (a lower W) raise the index of difficulty ID, so shrinking the "Touch target size" slider below the 44 pt Apple/Google minimum makes every glance longer. Voice-first interaction collapses most taps into a single spoken command, cutting the number of glances roughly to one per three steps.

While a glance is "down" (eyes on the screen), the car keeps moving blind:

blind distance = speed × eyes-off-road time

The simulator places another vehicle ahead at a random 35–55 m gap. If that gap reaches zero while your eyes are still down for a glance, it's a collision — exactly the real-world failure mode these guidelines exist to prevent. Watch the "Gap to vehicle ahead" readout and the eyes-off-road budget bar as the task runs.

EYES ON ROAD

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