ROSPA

Articles, guides, and products tagged "ROSPA" — a combined view of every catalogue resource on this topic.

User guide

Defensive riding in mixed motor traffic: lane positioning, primary vs secondary position, door zone, right hook + left cross at the intersection, SMIDSY / look-but-failed-to-see — how to avoid conflicts with cars

Unlike braking technique, cornering, or night riding, a separate safety layer is the **strategy of interacting with motor traffic**: where to position yourself in the lane, how to read drivers before an intersection, where the door zone sits, what right hook and left cross are, and why statistically the **intersection** — not the straight section — is the more dangerous segment (NACTO: >40% of urban bike fatalities in 2022 happened at intersections; UK DfT 2022: e-scooter casualty rate is three times higher than for pedal cycles). This guide transfers to the e-scooter the classic principles of vehicular cycling (John Forester, *Effective Cycling* 1976, MIT Press 7th ed. 2012), Smart Cycling of the League of American Bicyclists, the NACTO Urban Bikeway Design Guide 3rd ed. 2025, the AASHTO Guide for the Development of Bicycle Facilities, ROSPA UK road-safety guidance, IIHS, and AAA Foundation research. Covers: lane-positioning theory (primary vs secondary position; why 'as far right as possible' is the worst strategy); door zone (12-27% of urban bike collisions — Wikipedia; Dutch Reach countermeasure); right hook (a turning vehicle crosses the bike lane), left cross (an oncoming driver turns across your path); SMIDSY / look-but-failed-to-see as a perceptual phenomenon (Hurt Report 1981 motorcycle baseline, 75% of motorcycle crashes involve a passenger car, 66% are ROW violations); 5 active-signalling rules (positioning + eye-contact + speed-modulation + escape-path + worst-case escape); why a bike lane is not always safer than the road; how to ride with the flow (vehicular) vs in a facility (segregated); a 30-minute practice drill.

13 min read

User guide

E-scooter braking technique: progressive squeeze, threshold braking, weight transfer, dry vs wet, regen integration

An e-scooter's stopping distance isn't a brake spec — it's the sum of the rider's reaction distance (≈1.5 s × speed) and physical braking distance ½v²/(μg), which grows quadratically with speed: at 25 km/h reaction-plus-braking is ≈14–15 m on dry, at 45 km/h it's already 30–35 m, at 65 km/h over 60 m. The tire-road friction coefficient μ_dry ≈0.7 on clean asphalt drops to μ_wet ≈0.3 in rain, μ_paint ≈0.1 on fresh markings, and μ_steel ≈0.1 on wet manhole covers — meaning the same speed needs two to seven times more distance. Under a hard stop, weight transfers forward to 70–80 % because of the rider's high CoG and the e-scooter's short wheelbase, so the front mechanical disc does the bulk of the work and the rear (mech or regenerative) helps. Threshold braking means decelerating just below the lockup point, because μ_static > μ_kinetic. Progressive squeeze (force ramping over 0.2–0.3 s) lets weight transfer to the front wheel before full torque is applied — otherwise the front locks before it's loaded and you go over the bars. Regenerative braking delivers up to 20 % of mechanical peak and **vanishes at low speed** (no back-EMF), so an emergency stop without mech brakes is impossible. This guide is drill-oriented: physics, weight transfer, progressive vs grab, dry vs wet vs paint vs steel, regen integration, a 4-step emergency-stop protocol. ENG-first sources: MSF Basic RiderCourse Quick Tips, IAM RoadSmart, RoSPA, NHTSA/FHWA stopping-distance data, IIHS friction tables, Cycling UK braking guide, Park Tool / Sheldon Brown bicycle dynamics, Helsinki TBI series (PMC 8759433).

14 min read