M25 Managed Motorways J16 - Highways Agency

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Annex AConsultation Paper – Controlled MotorwaysM25 Junctions 16 to 233 VARIABLE MANDATORY SPEED LIMITS3.1 INTRODUCTIONThe Controlled Motorway Scheme will be implemented on the M25 betweenJunctions 16 and 23.In order to inform motorists that they are entering the Controlled MotorwayScheme area, fixed signage on main carriageways and slip roads will indicateentry and exit locations.During normal motorway operation, signals on gantries will be blank and themotorway will operate as a standard motorway.When variable mandatory speed limits are in operation, the variable mandatoryspeed limit signals will be displayed on gantries on the M25 between Junctions16 and 23. The signals are capable of displaying one of three mandatorysettings, 40 mph, 50 mph or 60 mph. The speed selected will depend uponprevailing traffic conditions and is automatically calculated from sensors buriedin the road surface. It is also possible to manually set mandatory speed limitsignals to show a speed below 40 mph.To confirm that the speed limit is mandatory and enforceable, the speed shownwill have a red circle around it signifying that the speed is to be obeyed as is thecase with all other mandatory speed limit signs.Some gantries will be fitted with HADECS 2 capable of providing evidence tosecure prosecutions for speeding under the Road Traffic Act 1988.The Operational Regimes to be implemented within the Controlled MotorwayScheme include:Normal operationVariable mandatory speed limits to manage congestionIncident management6
Annex AConsultation Paper – Controlled MotorwaysM25 Junctions 16 to 233.2 NORMAL OPERATIONDuring normal motorway operation, signals on gantries will be blank and themotorway will operate as a standard motorway, as shown in Figure 3A below.This follows the same operating approach as the existing controlled motorwayscheme operating on the M25 between Junctions 10 to 16. When any otheroperational regime is introduced signals will be displayed over the carriagewaylanes.Figure 3A: The Controlled Motorway Scheme during Normal OperationRelevant Questions:When variable mandatory speed limit signs are left blank what speed limits apply?When signs are left blank the motorway will revert to the National Speed Limit and thereforea maximum speed of 70mph will apply to all lanes.7
Page 1: M25 Controlled Motorway January 201
Page 4 and 5: Getting to thisstage:In November 20
Page 6 and 7: Executive SummaryThis consultation
Page 8 and 9: Annex AConsultation Paper - Control
Page 10 and 11: Annex AConsultation Paper - Control
Page 14: Annex AConsultation Paper - Control
Page 21 and 22: Title:M25 J16-23 Controlled Motorwa
Page 23 and 24: Evidence Base17
Page 25 and 26: 2. Rationale for InterventionThe Hi
Page 28 and 29: 4. Description of Options22
Page 30 and 31: 4.2 Option 1 (Preferred): Controlle
Page 32 and 33: 5. Details of Costs and Benefits26
Page 34 and 35: 5.2 Option 1 (Preferred): Controlle
Page 36 and 37: allows more accurate quantification
Page 38 and 39: RECURRING: A reduction in incident
Page 40 and 41: 6. Rationale and Evidence for Propo
Page 42 and 43: 8. Direct Costs and Benefits to Bus
Page 44 and 45: 9.1 Justice SystemIn Controlled Mot
Page 46 and 47: 10. Recommendation, Implementation
Page 48 and 49: 10.2 Implementation PlanThe optimum
Page 51 and 52: Annex 1: Post Implementation Review
Page 53 and 54: Member of the publicOther (please d
Page 55 and 56: Company Name Recipient Address Emai
Page 63 and 64:
Company Name Recipient Address Emai
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M25 Managed Motorways J16 - Highways Agency

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