UK motorbike collision claims for SMIDSY, filtering and lane-change cases

Highway Code H1 to H3: the hierarchy of road users since 29 January 2022

The starting point on any UK motorbike collision file is the Highway Code introduction. As revised by the Department for Transport with effect from 29 January 2022, rules H1, H2 and H3 introduce a hierarchy of road users. Rule H1 places the greatest responsibility on the road users who can do the greatest harm - drivers of HGVs and large passenger vehicles first, then drivers of cars, taxis and vans, then motorcyclists, then cyclists, with pedestrians at the bottom and carrying the least responsibility. Motorcyclists sit below cyclists in the hierarchy but are still classified as vulnerable road users; in a conflict between a car driver and a motorcyclist the duty weight rests with the car driver.

Rule H2 adds a positive give-way duty on drivers and motorcyclists at every junction to pedestrians waiting or already crossing the road into which the driver is turning. Rule H3 adds a give-way duty on drivers and motorcyclists not to cut across cyclists going straight ahead at junctions and not to turn at a junction in a way that would cause a cyclist to stop or swerve. The hierarchy is not a substantive head of law in its own right - section 38(7) of the Road Traffic Act 1988 makes Highway Code breaches admissible rather than determinative - but in practice every major UK motor insurer (Aviva, AXA, Allianz, Direct Line, Admiral, LV=, Hastings and others) treats the hierarchy as the framing principle for apportionment in any motorbike or cyclist file.

Filtering and lane-splitting: legal, but with a duty of care

Filtering is the manoeuvre of a motorcyclist riding between lanes of stationary or slow-moving traffic. It is permitted in the UK - the Highway Code does not prohibit it, and rule 88 expressly contemplates filtering by advising motorcyclists to make themselves easy to see and to be aware that other drivers may not have seen them. Rule 211 mirrors the duty from the driver's side: drivers must look out for motorcyclists in slow-moving traffic where they may be filtering. The manoeuvre is distinct from undertaking, which is generally prohibited on a motorway by rule 268 unless the traffic in the right-hand lane is moving more slowly than the traffic in the lane to its left.

The leading authority on filtering apportionment is Davis v Schrogin [2006] EWCA Civ 974, in which the Court of Appeal confirmed that a filtering motorcyclist is not automatically contributorily negligent. On the facts of that case a motorcyclist filtering past a queue at a roundabout entrance recovered without reduction, with primary liability resting on the driver who turned across the filtering line without looking. The older first-instance authority of Powell v Moody (1966) 110 SJ 215 had previously set the contrary baseline, but Davis is now the better view and routinely cited by motorcyclist solicitors. Woodham v J M Turner (T/A Turners of Great Barton) [2012] EWCA Civ 375 applied a similar fact-sensitive apportionment to a motorbike overtaking a queue when a vehicle turned right across the overtake.

Practical filtering-claim outcomes track the facts. A motorcyclist filtering at a low differential speed (10 to 15 mph faster than the queue) into a car that changes lane without indicating normally recovers at 100 per cent. The same motorcyclist filtering at a high differential (40 mph past a stationary queue) into a car turning across the filtering line typically attracts a contributory reduction of 20 to 33 per cent. A door-strike on a filtering motorcyclist by a vehicle occupant opening an offside door is normally 100 per cent on the door-opener under Highway Code rule 239 and section 42 of the Road Traffic Act 1988.

The six recurring driver-versus-motorbike collision patterns

SMIDSY at a junction. A driver emerging from a side road into the path of a motorcyclist on the main road, or turning right out of a side road across the line of an approaching motorcyclist. The most common single pattern. Primary liability normally rests with the emerging driver under rules 170 and 211.

Right-hook (driver turning right across an oncoming motorcyclist). A driver turns right across the path of an oncoming motorcyclist who has priority on the main road. Highway Code rule 180 requires the turning driver to give way to oncoming traffic; failure to do so puts liability at or near 100 per cent on the turner.

Lane-change into a filtering motorcyclist. A driver in slow-moving or stationary traffic changes lane without checking the offside blind spot and strikes a motorcyclist filtering between the lanes. Rule 161 (mirror use and head-check) and rule 211 (look out for motorcyclists in slow-moving traffic) both engaged; primary liability normally with the changing driver.

Side-swipe during overtake. A driver overtaking a motorcyclist on a single-carriageway A-road or urban street gives insufficient clearance. Rule 213 requires the same room as a car. A close-pass collision is on the overtaking driver, with a small contributory reduction possible where the motorcyclist swerved into the passing line.

Door-strike on a filtering motorcyclist. A vehicle occupant - driver, passenger or rear-seat passenger - opens an offside door into a filtering motorcyclist. Rule 239 requires careful observation before opening any door and from 2022 specifically recommends the Dutch reach. Section 42 RTA 1988 and the Construction and Use Regulations 1986 make opening a door so as to cause injury or danger an offence. Liability normally 100 per cent on the door-opener.

Roundabout-exit collision. A motorcyclist already on a roundabout is struck by a car entering the roundabout from the left, the entering driver having failed to give way at the give-way line. Rule 184 governs roundabout entry; the entering driver carries primary liability.

Filtering and overtake apportionment authorities: Powell, Davis and Woodham

Three appellate authorities anchor the filtering and overtake apportionment frame. Powell v Moody (1966) 110 SJ 215 was the older first-instance decision that imposed a substantial contributory deduction on a filtering motorcyclist; it is the historic baseline and is still cited but largely superseded. Davis v Schrogin [2006] EWCA Civ 974 is the Court of Appeal authority that recalibrated the position: a motorcyclist filtering past a queue at a low-to-moderate differential speed is not, by virtue of filtering alone, contributorily negligent. The motorcyclist recovered without reduction on the facts. Davis is now the better view and routinely cited by claimant motorcyclist solicitors.

Woodham v J M Turner (T/A Turners of Great Barton) [2012] EWCA Civ 375 deals with a motorcyclist overtaking a queue of traffic, rather than filtering between lanes, where a vehicle in the queue turned right across the overtake into a side road. The Court of Appeal applied a fact-sensitive apportionment, dividing liability between the turning vehicle and the overtaking motorcyclist. The case illustrates that motorbike overtake claims are not formulaic - the angle of turn, the lead time on the indicator, the road markings (solid white centre line versus broken), the dashcam and helmet-camera footage all feed the percentage.

The practical lesson is to verify each citation on bailii.org before relying on it in correspondence with an insurer or a solicitor. Powell v Moody is reported in the Solicitors Journal and is not on BAILII; Davis and Woodham are both on BAILII at the citations given. Where a citation is contested, CityGrip's panel solicitor will sense-check the report against the Law Reports or the Lexis citator before it is used as authority.

Helmet non-use, hi-vis clothing and the Smith v Finch contributory frame

Section 16 of the Road Traffic Act 1988 and the Motor Cycles (Protective Helmets) Regulations 1998 (SI 1998/1807) require motorcyclists and pillion passengers on a motor bicycle on a road to wear an approved helmet conforming to one of the listed safety standards. Failure to wear an approved helmet, or wearing a helmet with the chin strap unfastened or incorrectly secured, is a criminal offence and opens the door to a civil contributory-negligence argument. The contributory frame is causation-gated: the defendant must prove on the balance of probabilities that wearing a properly secured helmet would have prevented or materially reduced the particular injury sustained.

The leading authority on the helmet contributory frame for cyclists is Smith v Finch [2009] EWHC 53 (QB), which established that a non-helmet-wearing cyclist could be contributorily negligent in principle but on the facts there was no causation between the absence of a helmet and the injury sustained, so no deduction applied. The principle was applied to a motorcyclist in Sweeney v Westerman [2010] EWHC 3304 (QB), with a contributory deduction made where the helmet evidence supported a causation link. Verify each citation on bailii.org before relying on it; Smith v Finch is reported and on BAILII.

Hi-vis clothing follows an analogous frame under Highway Code rules 86 and 87. Failure to wear light or fluorescent clothing in daylight, or reflective material in poor visibility and at night, can support a contributory deduction where the defendant proves a causation link between the absent kit and the collision. The typical reduction is 10 to 25 per cent and is rejected outright where the driver's failure to look was the proximate cause regardless of clothing - Froom v Butcher [1976] QB 286 supplies the seat-belt analogy. CityGrip's view, applied across the motorbike file pipeline, is that the hi-vis argument is routinely overstated by defendant insurers and routinely conceded too easily by claimant motorcyclists.

Notification, the OIC threshold and the serious-injury referral route

Section 170 of the Road Traffic Act 1988 requires every driver involved in a road traffic collision to stop, exchange names, addresses, vehicle registrations and insurer details with anyone reasonably requiring them, and - where injury is present or details cannot be exchanged at the scene - report the collision to the police as soon as reasonably practicable and in any event within 24 hours. In a driver-versus-motorbike file the motorcyclist injury threshold is almost always met, so the police-report duty is triggered. Beyond that statutory duty, the driver must notify their own motor insurer regardless of fault within the policy's notification window (normally 24 to 48 hours).

For the personal-injury claim itself the routing question is whether the general-damages valuation crosses the £5,000 Civil Liability Act 2018 small-claims threshold. Soft-tissue claims valued below that figure are routed through the Official Injury Claim portal under the Whiplash Injury Regulations 2021 and the revised whiplash compensation tariff in the Whiplash Injury (Amendment) Regulations 2025 (SI 2025/615). Serious-injury motorbike claims rarely sit at that level - typical valuations include £20,000 to £150,000 for a complex orthopaedic injury and significantly more for a traumatic brain injury, internal injury or spinal injury. Those claims sit outside the portal and proceed as a full personal injury claim after a car accident - typically funded under a no win, no fee conditional fee agreement with an SRA-regulated solicitor on the standard litigation route.

CityGrip's referral process is to identify a likely serious-injury file at intake, obtain a separately signed consent form for personal-injury referral (distinct from the accident-management instruction), and refer to a panel solicitor with a rehabilitation-needs assessment under the 2015 Rehabilitation Code. The three-year limitation period under section 11 of the Limitation Act 1980 runs from the date of the accident or the date of knowledge; section 28 suspends the clock for minors and protected parties. Where the at-fault driver was uninsured or rode off without exchanging details, the file routes through the MIB - see our pages on a MIB uninsured driver claim or a MIB untraced driver claim. The diary date is set at intake.

Related UK collision-type and vulnerable-road-user pages

Each linked page deepens one part of the driver-versus-motorbike picture. The collision-types hub gathers all 24 UK scenarios; the cyclist, HGV and horse-rider pages cover the other three vulnerable-road-user verticals; the lane-change and junction pages cover the cross-cutting collision patterns where most motorbike collisions actually occur. The /vehicles/motorbike page is a separate vehicle-class overview written from the rider's standpoint - useful as a companion reference, not a duplicate.

• UK collision types hub
• Car accident claims
• Non-fault car accident claims
• Cyclist collision claims
• HGV collision claims
• Horse-rider collision claims
• Lane-change accident claims
• Junction accident claims
• Motorbike (vehicle class)

Six-step driver post-motorbike-collision flow

1. Step 1

   Make the scene safe and treat the motorcyclist as the priority casualty

   Stop the car, engage hazards and dial 999 immediately. In a driver-versus-motorbike collision the motorcyclist is almost always the primary casualty - even a low-speed impact can cause concussion, fractures, internal injury or spinal trauma. Do not move the motorcyclist or remove the helmet unless airway management absolutely requires it; the helmet provides cervical-spine support and removing it without a second rescuer can convert a stable injury into a catastrophic one. Move only if a fuel leak or fire risk forces it. Note the location, the marker-post number if on a motorway, and the exact time of impact to one-minute precision before any vehicle is moved.

2. Step 2

   Comply with the section 170 RTA 1988 duty to stop, exchange details and report

   Section 170 of the Road Traffic Act 1988 requires every driver involved in a road traffic collision to stop at the scene and exchange names, addresses, vehicle registrations and insurer details with anyone reasonably requiring them. Where the motorcyclist is injured - which in a driver-versus-motorbike file is almost always the case - the collision must be reported to the police as soon as reasonably practicable and in any event within 24 hours, regardless of whether police already attended. Get the police incident number, the attending officers' shoulder numbers and the name of the collision-investigation officer if a Roads Policing Unit attended.

3. Step 3

   Capture motorbike-collision-specific scene evidence

   Photograph the resting position of both the car and the motorbike, the contact points (front offside of the car and front or right side of the bike for a SMIDSY; offside of the car and right side of the bike for a filtering lane-change; etc.), the road environment from at least three angles, the lane markings, any skid marks, yaw marks or gouges in the tarmac, and the debris field. Photograph the motorcyclist's helmet (in situ if safe, otherwise where it lies after recovery), the protective jacket, gloves and boots, and any high-visibility kit. Extract the dashcam clip for the ten seconds before, during and after impact. Note any independent witness contact details before they leave the scene.

4. Step 4

   Preserve the motorcyclist's helmet camera and any bike event-data-recorder data

   Helmet-mounted cameras (GoPro, Sena, Insta360) and motorbike event-data-recorder modules carry decisive evidence that overwrites quickly. With the motorcyclist's consent - or, where the motorcyclist is hospitalised, through the family or appointed representative - the SD card from the helmet camera should be removed and backed up to the cloud the same day. The bike's ABS and traction-control logs, and the event-data-recorder if fitted, can be downloaded by the manufacturer's dealer or a qualified forensic engineer. The five-to-ten-second pre-impact window is what insurer engineers and any reconstruction expert will analyse against the dashcam timeline.

5. Step 5

   Notify insurers and arrange independent engineer inspection

   Notify your own insurer of the collision regardless of fault - every UK motor policy carries a notification clause, usually inside 24 to 48 hours, and a failure to notify can be raised by insurers as a policy breach even on a non-fault file. CityGrip Accident Claims notifies the at-fault driver's third-party insurer in writing the same day, opens the credit-hire file for a like-for-like replacement car, and arranges an independent engineer inspection of the bike and the car. The motorbike is normally inspected at a specialist motorcycle storage yard rather than a general bodyshop - write-off thresholds, ABI Code of Salvage categorisation (CAT B / S / N) and helmet replacement value all sit inside the engineer report.

6. Step 6

   Refer any serious injury to an SRA-regulated solicitor under separate signed consent

   Where the motorcyclist has suffered a serious injury - traumatic brain injury, multiple fractures, internal injury, degloving or any injury requiring overnight hospitalisation - the file sits outside the Official Injury Claim portal under the Civil Liability Act 2018 threshold and proceeds through an SRA-regulated solicitor on the standard litigation route. CityGrip refers personal-injury work to a panel solicitor under a separately signed consent form, with rehabilitation arranged under the 2015 Rehabilitation Code where appropriate. The car-driver claimant's own injury (commonly cervical or thoracic from the impact) is referred in parallel where they are non-fault.