Ideal Braking Distance Comparison
Compare explicit reaction and ideal constant deceleration or friction-and-grade scenarios.
A QUICK WALKTHROUGH
How to use this tool
- Select the model and explicitly enter each value and unit.
- Add named scenarios and any applicable user limits.
- Calculate, compare every row and copy or download the fixed report.
Equations and units
θ = atan(grade/100); a = g × (μ cos θ + sin θ); reaction distance = v × t; braking distance = v²/(2a); total distance = reaction + braking; braking time = v/a; total time = reaction + braking time for moving input. 1 mph = 0.44704 m/s; 1 km/h = (1/3.6) m/s; 1 ft/s² = 0.3048 m/s².
Scope
PARTIAL: real vehicle and road prediction is unavailable. Do not use for driving decisions, legal compliance, vehicle performance or safe following distance. Stationary input gives zero distance and zero time; moving input requires positive net deceleration.
Local processing
Inputs remain in this browser. Report numbers use full JavaScript floating-point precision; decimal inputs may round when parsed. No display rounding is applied.
GOOD TO KNOW
Common questions
Does this approve a vehicle operation?
No. This is arithmetic with user parameters and stated assumptions.