“16…Two common (and related) errors are to suppose: (1) that the stronger and more vivid is our feeling or experience of recollection, the more likely the recollection is to be accurate; and (2) that the more confident another person is in their recollection, the more likely their recollection is to be accurate.”
“19. The process of civil litigation itself subjects the memories of witnesses to powerful biases. The nature of litigation is such that witnesses often have a stake in a particular version of events. This is obvious where the witness is a party or has a tie of loyalty (such as an employment relationship) to a party to the proceedings. Other, more subtle influences include allegiances created by the process of preparing a witness statement and of coming to court to give evidence to one side of the dispute. A desire to assist, or at least not prejudice, the party who called the witness or that party’s lawyers, as well as a natural desire to give a good impression in a public forum, can be significant motivating forces. 20. Considerable interference with memory is also introduced in civil litigation by the procedure of preparing for trial. A witness is asked to make a statement, often (as in the present case) when a long time has already elapsed since the relevant events. The statement is usually drafted for the witness by a lawyer who is inevitably conscious of the significance for the issues in the case of what the witness does or does not say. The statement is made after the witness’s memory has been “refreshed” by reading documents. The documents considered often include statements of case and other argumentative material as well as documents which the witness did not see at the time or which came into existence after the events which he or she is being asked to record. The statement may go through several iterations before it is finalised. Then, usually, months later, the witness will be asked to re-read his or her statement and review documents again before giving evidence in court. The effect of this process is to establish in the mind of the witness the matters recorded in his or her own statement and other written material, whether they be true or false, and to cause the witness’s memory of events to be based increasingly on this material and later interpretations of it rather than on the original experience of the events.”
“1.35. Handrails should be spaced away from the wall and rigidly supported in a way that avoids impeding finger grip. 1.36. Handrails should be set at heights that are convenient for all users of the building and should extend safely beyond the top and bottom of a flight of steps, or a ramp, to give both stability and warning of the presence of a change in levels. Consideration should be given to the provision of a second handrail on stairs in a wide range of building types…”
“1.37 Handrailing to external ramped and stepped access will satisfy requirement M1 ... if: (a) The vertical height to the top of the upper handrail from the pitch line of the surface of a ramp, or a flight of steps, is between 900mm and 1000mm, and from the surface of a landing is between 900 and 1100mm (see diagram 5); (b) Where there is full height structural guarding, the vertical height to the top of a second lower handrail from the pitch line of the surface of a lamp, or a flight of steps, is 600mm, where provided; (c) It is continuous across the flights and landings of ramped or stepped access; (d) It extends at least 300mm horizontally beyond the top and bottom of a ramped access, all the top and bottom nosing of a flight or flights of steps, while not projecting into an access route; (e) It contrasts visually with the background against which it is seen, without being highly reflective; (f) Its surface is slip resistant and not cold to the touch; (g) It terminates in a way that reduces the risk of clothing being caught; (h) Its profile is either circular with a diameter of between 40 and 45mm or oval preferably with a width of 50mm (see diagram 7); (i) It protrudes no more than 100mm into the surface width of the lamp or stepped access where this would impinge on the stair with requirements of part B1; (j) There is a clearance of between 60 and 75mm between the handrail and any adjacent wall surface; (k) There is a clearance of at least 50mm between a cranked support and the underside of the handrail; (l) Its inner face is located no more than 50mm beyond the surface width of the ramped or stepped access.”
“Handrails. In addition to guarding, it is also necessary to provide handrails for the safety and convenience of persons using the stairs. A handrail is necessary for balance and support… it is recommended that every flight of stairs having an aggregate rise of more than 600mm should have a continuous handrail fixed securely at a height of not less than 840mm or more than 1000mm measured vertically above the pitch line. A handrail shall be fixed on each side of the stairway where the width of the stair is 1000mm all over… the handrail section which provides the most comfortable grip is circular and between 45mm and 50mm in diameter. Whatever the shape, the handrail section should be capable of being readily gripped by hand, and sharp arrises should be avoided. Reference should be made to the relevant mandatory regulations.”
“Use of this document. As a Code of Practice, this part of BS 5395 takes the form of guidance and recommendations. It should not be quoted as if it were a specification and particular care should be taken to ensure that claims of compliance are not misleading. Any user claiming compliance with this part of BS 5395 is expected to be able to justify any course of action that deviates from its recommendations. It has been assumed in the preparation of this British Standard that the execution of its provisions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced. Where methods of design, materials, components and methods of construction are not covered by this standard, or by any other British Standard, this is not necessarily to be regarded as discouraging their use.”
“Use of a suitably designed handrail can prevent users from losing their balance when on the stair and can also assist users to ascend by pulling themselves up the stairs. A handrail can also help users to regain balance in the event of a fall, reducing the severity of the injuries that might result. The need for a handrail on both sides of the stair comes from two sources. Firstly, to allow users a choice of support when ascending and descending stairs, it is preferable to have a handrail on both sides. This can be essential for people using a walking stick or cane or who might be weaker on one side. The other reason is that having two handrails reduces the chances of a serious incident happening on a stair. Every stair should have two continuous handrails, one on each side of the stair, to provide guidance and support to those using the stair. It is advantageous to many stair users to be able to reach either handrail or both handrails at the same time in which case, the distance between the handrails should be between 800mm and 1200mm. Handrails should: (a) Be fixed at a vertical height to the top of the handrail above the pitch line between 900mm and 1000mm; (b) Continue across intermediate landings at a vertical height to the top of the handrail above the landing between 900mm to 1100mm where this is practicable e.g. not across doorways or obstructing adjacent circulation routes; (c) Be fixed parallel to the pitch line oversteps, or horizontal over landings; (d) Be rigid and strong enough to provide adequate support for users; (e) Be comfortable to grip and without sharp arrises, yet able to provide adequate resistance to hand slippage; (f) Allow the entire hand to form a grip around the handrail, rather than a less secure pinch grip which uses just the fingers. This requires a clear mounting distance between the bottom of the handrail and the top of the stair balustrade of at least 50mm; (g) Be continuously graspable along their entire length. Handrail brackets or balusters attached to the bottom surface of the handrails are not considered to be obstructions to a person’s grip, provided that they do not project horizontally beyond the sides of the handrail within 50mm of the bottom of the handrail; (h) Be a poor conductor of heat, if exposure to heat or temperatures below 0C is likely; (i) Extend at least 300mm on plan beyond the top and bottom nosing of a flight or flights of steps, providing it does not project into an access route; (j) Be finished so as to provide visual contrast with the surroundings against which it is seen.”
“Are functional handrails within our reach and grasp?”
“alcohol consumption may induce stair falls. From Svanstrom’s study (1973), about 16% of people who fell on the stairs had consumed alcohol immediately before the accident…”
“Those who have examined the question of the handrail shape have agreed that a circular shape will maximise tangential forces over a wide range of hand sizes and shapes. Several researchers have studied grip force… examining the various types of grip, including the power grip (figure 6.2) and pinch grip (figure 6.3). These studies are not strictly transferable to handrail applications; nevertheless, they provide influential evidence that the power grip is likely to permit a stronger grasp than the pinch grip. The power grip, by definition, brings all of the finger and hand segments into contact with the handrail, which is necessary in order to optimise the effective normal forces. The most thorough and recent study of handrail shape was by Brian Maki (1985)… he concluded that the largest stabilising forces were generated by using 1.5” (3.8cm) circular rails. The smallest forces were generated using the vertical rectangular and the decorative rails… For grip and sliding comfort, based on the preference, the circular and overall handrails had the best ratings; narrow rectangular and decorative railings had the worst. Handrail shape also must be considered for uses that are not of the grip pull–up or push–down kind. There are times, probably during falls or where a loss of balance has occurred, when one may have to push away from the handrail or pull oneself toward it. By definition, these are normal forces, and, in the former case, the force is usually transmitted through the surface of the hand with no gripping. To minimise tissue damage or discomfort, the load should be spread over as much of the hand as possible. Handrails with elaborate mouldings may act to concentrate on forces on an edge of a decorative element and for this reason are undesirable. Ideally then a handrail that will meet the condition best will present a large surface area. When one has to pull oneself towards the handrail, perhaps to prevent a sideways fall in the opposite direction, the pull is transmitted largely through the hand with fingers locked across the rail and protruding down on its far side. The handrail shape to optimise this action is the same as that for the push–pull action except that we are largely concerned with the shape on the outside of the rail. Therefore, the shape must maximise the number of finger joints contributing to the pulling force. Obviously tissue damage or decreased performance will be present also if we must pull against some sharp–edged ornamental moulding. Certain shapes and sizes may force the wrist away from an optimal position to grip the rail. This is particularly important for the elderly, who may have a reduced range of joint rotation and loss of strength. Maki and Fernie have pointed out: ‘the line of action of the push/pull force should coincide with the natural thrust access of the forearm, i.e. a line passing from the lateral edge of the elbow to the top of the extended index finger. Handrail shapes and sizes that require wrist extension or flexion (away from the optimal position) to achieve a comfortable (i.e. conformable) gripping position will shift this line of action, resulting in a bending movement about the wrist. This movement must be resisted by the wrist musculature, which may limit the amount of handrail force that can be generated. A handrail with a wide, flat upper surface would seem to create this sort of problem (e.g. oblong with major axis horizontal) and should therefore be avoided’.”
“curiously, the literature on stair safety seldom discusses handrail visibility (however Alessi, Brill and Associates 1978) and yet the need for visibility seems obvious. Consider, for example, a white painted handrail fixed to a white wall or a dark wooden handrail to be viewed against a background of similar hue. It may be quite difficult to perceive the handrail with precision during a fall, and this is likely to be a major problem for those with visual impairments. It seems to make good sense that the handrail should be visible and stand out against the background.”
“it is improbable that in falling a user would be able to alter the hand position and grasp the handrail. Even if the user could do this, it is doubtful whether it would be enough to arrest that fall…”
“Guidance which can be provided with confidence is: (a) The handrail height should be between 935 mm and 1000 mm above the pitch line for adults. (b) The shape should be circular and of 32 to 50mm diameter, or oval with a thickness of 18 to 37mm horizontally and 32 to 50mm vertically. (c) The handrail should be of varnished hardwood, enamel paint on metal or vinyl or Doverite-covered steel. The following guidance is suggested but should be validated: (d) The clearance between the handrail and the wall should be between 80 and 92 mm. (e) The handrail should extend 30 mm beyond the top and bottom of the stairs. (f) The handrail should be in visual contrast to its surroundings. (g) A handrail should be provided on both sides of the stairs.”
“ease of gripping – the characteristics which enable a handrail, once it has been taken hold of, to be easily and continuously held and afford a secure support for the hand to prevent a fall occurring.” “ease of grasping – the characteristics of a handrail which enable it to be taken hold of and which, in an emergency, assist in arresting a fall.”