The subtle art of designing physical controls for cars

Physical vs Touch Controls & Safety

• Strong consensus that frequently used driving controls (HVAC, defrost, wipers, audio volume) should be operable “eyes‑free” via dedicated physical controls.
• Touchscreens are widely criticized as distracting, modal, and unsafe, especially when buried in menus or blacked out at night.
• Several commenters report actively avoiding new cars or specific brands because of touchscreen‑heavy or over‑digitalized interiors.

The “Smart Knob” Concept

• Many like that the article takes UX and haptics seriously instead of “just throw it on a screen.”
• However, the multifunction, modal knob is seen as inferior to 2–3 simple knobs:
  • You must track what mode it’s in, often requiring a glance.
  • Cognitive overhead and loss of muscle memory reduce confidence in blind operation.
• Symmetrical, motorized knobs without absolute position or tactile pointers are viewed as worse than simple knobs with hard end‑stops and detents.
• Some suggest pairing the haptic knob with dedicated mode buttons around/under it to reduce modality.

Climate Control, Automation, and Comfort

• Experiences with “AUTO” climate are mixed:
  • Some say a good auto system means you rarely touch controls.
  • Others in harsher climates (very hot/cold, mountains, fog) frequently adjust defrost, fan, or temperature.
• Complaints that thermostatic systems often misalign with subjective comfort, sun load, clothing, and recent exposure.
• Desired behaviors include:
  • Fast initial heating/cooling, then backing off.
  • Ability to set a temperature range rather than a single point.
  • Reliable physical defrost/defog buttons, always in the same place.

Cost, Manufacturing, and Longevity

• Touchscreens are seen as cheaper and easier for manufacturers: fewer parts, fewer harness variants, easier assembly, and feature differentiation via software.
• Physical buttons add cost, breakage points, and trim complexity, but are easier to repair and upgrade (e.g., DIN head units).
• Integrated, all‑in‑one digital systems can render cars effectively disposable when the screen/computer ages or fails.

Alternative Interfaces & Broader UX Points

• Voice control is proposed but criticized for reliability, noise, and user dislike of talking to cars.
• Some envision modular standardized physical controls with small displays, or third‑party “button strips.”
• Several note that HCI best practices (Fitts’ Law, non‑modal design, aging eyesight, consistent controls) are being rediscovered or ignored in modern cars.
• Nostalgia is strong for older designs with simple 3–4 knob HVAC blocks, intuitive seat controls, and low‑glare “night” modes.