Colregs Questions and Answers (Q & A)

Rule 10

Traffic separation schemes

The answers can be found in the respective Rules and Paragraphs in the book"International Regulations for Preventing Collisions at Sea (Colregs) by Capt. Pierre Deseck and/or in the Colregs Presentation (on DVD), also by Capt. Pierre Deseck

Q = Question; A= Answer

Q 10-1
Which body is officially responsible for the implementation of traffic sep­aration schemes ?

A 10-1
Rule 10 (a) and Par 10.2, Application.


Q 10-2
Explain the principles on which traffic separation schemes are based.

A 10-2
Par. 10.1, General, second paragraph.


Q 10-3
 Are traffic separation schemes compulsory ?

A 10-3
Par. 10.1, General, fifth paragraph.


Q 10-4
 What are mandatory routing systems ?

A 10-4
Par. 10.1, General, fifth paragraph and General provisions on ships’ routeing,Par.2, Definitions


Q 10-5
 Give some valuable reasons why the master of a vessel should decide not to use a traffic separation scheme.

A 10-5
Par. 10.1, General, fifth paragraph.
Click on use of separation scheme for a summary


Q 10-6
 By what Provisions, Regulations and Notes are traffic separation schemes governed ?

A 10-6
Par. 10.1, General, ninth paragraph.
Click on Provisions for a summary


Q 10-7
 What are the objectives of a routeing system ?

A 10-7
General provisions on ships’ routeing, Par. 1, Objectives.
Click on objectives of routeing systems for a summary


Q 10-8
 Define the term routing system.

A 10-8
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-9
 Define the term traffic separation scheme.

A 10-9
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-10
 Define the term separation zone or line.

A 10-10
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-11
 Define the term traffic lane.

A 10-11
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-12
 Define the term roundabout.

A 10-12
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-13
 Define the term inshore traffic zone.

A 10-13
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-14
 Define the term two-way route.

A 10-14
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-15
 Define the term recommended route.

A 10-15
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-16
 Define the term recommended track.

A 10-16
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-17
 Define the term deep-water route

A 10-17
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-18
 Define the term precautionary area.

A 10-18
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-19
 Define the term area to be avoided.

A 10-19
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-20
 Define the term established direction of traffic flow.

A 10-20
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-21
 Define the term recommended direction of traffic flow.

A 10-21
General provisions on ships’ routeing, Par.2, Definitions.


Q 10-22

 Describe the content of Figure 10.1.


A 10-22
General provisions on ships’ routeing, Par. 4, Methods, Sub par. 4.1.


Q 10-23

 Describe the content of Figure 10.3.


A 10-23
General provisions on ships’ routeing, Par. 4, Methods, Sub par. 4.3.


Q 10-24

 Describe the content of Figure 10.5.


A 10-24
General provisions on ships’ routeing, Par. 4, Methods, Sub par. 4.5, .1Roundabouts.


Q 10-25

 Describe the content of Figure 10.10.


A 10.25
General provisions on ships’ routeing, Par. 4, Methods, Sub par. 4.5, .3Precautionary areas.


Q 10.26

 Describe the content of Figure 10.13.


A 10.26
General provisions on ships’ routeing, Par. 4, Methods, Sub par. 4.6 Other routeing methods.


Q 10-27
 Do ships in a traffic separation scheme have a privilege (or priority) on other ships ?

A 10-27
General provisions on ships’ routeing, Par. 8, Use of a routing sys­tem, Sub par. 8.4 and Par. 10.2, Application, third and fourth para­graph.


Q 10-28
 For what types of ships are deep-water routes intended ?

A 10-28
General provisions on ships’ routeing, Par. 8, Use of a routing sys­tem, Sub par. 8.6.


Q 10-29
 To which side should vessels keep in a two-way route ?

A 10-29
General provisions on ships’ routeing, Par. 8, Use of a routing sys­tem, Sub par. 8.8.


Q 10-30
 How are the general direction of established or recommended traffic flow indicated on the charts ?

A 10-30
General provisions on ships’ routeing, Par. 8, Use of a routing sys­tem, Sub par. 8.9.


Q 10-31
 What is the meaning of the signal YG ?

A 10-31
General provisions on ships’ routeing, Par. 8, Use of a routing sys­tem, Sub par. 8.10.


Q 10-32
 Comment briefly the guidelines on carriage of nautical publications.

A 10-32
Guidelines on carriage of nautical publications.


Q 10-33
 What are the criterions to which charts and ECDIS must satisfy ?

A 10-33

Guidelines on carriage of nautical publications, Par. 3, Charts.
Click on ECDIS for a summary


Q 10-34
 Which nautical publications should a vessel carry ?

A 10-34
Guidelines on carriage of nautical publications, Par. 4, Publications.
Click on nautical publications for a summary


Q 10-35
 How are amendments to existing traffic separation schemes promulgat­ed ?

A 10-35
Par. 10.2, Application.


Q 10-36
 How must vessels use a traffic separation scheme ?

A 10-36
Rule 10 (b) and Par. 10.3, Vessels using a traffic separation scheme.
Click on use of traffic separation scheme for a summary


Q 10-37
 In which lane must a vessel navigate in a traffic separation scheme ?

A 10-37
Rule 10 (b) (i) and Par. 10.3, Vessels using a traffic separation scheme, third paragraph.


Q 10-38
 In an traffic separation scheme, on which side should you leave a sep­aration line or separation zone ?

A 10-38
Rule 10 (b) (ii) and Par. 10.3, Vessels using a traffic separation scheme, fourth paragraph.


Q 10-39
 How should a vessel leave or join a traffic lane ?

A 10-39
Rule 10 (b) (iii) and Par. 10.3, Vessels using a traffic separation scheme, fifth paragraph.


Q 10-40
 How must vessels cross a traffic lane ?

A 10-40
Rule 10 (c) and Par. 10.4, Vessels crossing a traffic lane.

Click on cross a traffic lane for a summary

Click on cross a traffic lane for an animation


Q 10-41
 Comment how a slow power-driven vessel should cross a traffic lane with a strong side current.

A 10.41
Par. 10.4, Vessels crossing a traffic lane, Sub par. 1, Slow power-driv­en vessel crossing a traffic lane with a strong current.


Q 10-42

 Comment how a sailing vessel should cross a traffic lane with a wind head-on.

A 10-42
Par. 10.4, Vessels crossing a traffic lane, Sub Par.2, Sailing vessel crossing a traffic lane with a wind 90° to the lanes.


Q 10-43
 May vessels freely cross a traffic lane ?

A 10-43
Rule 10 (c) and Par. 10.4, Vessels crossing a traffic lane, last para­graph.


Q 10-44
 Where in a traffic lane should you avoid altering course to starboard for a vessel on your own starboard ? Illustrate your answer.

A 10-44
Par. 10.4, Vessels crossing a traffic lane, last paragraph.


Q 10-45
 What is the purpose of inshore traffic zones ?

A 10-45
Par. 10.5, Inshore traffic zones, first paragraph.
Click on inshore traffic zone for a summary


Q 10-46
 May a vessel freely use a inshore traffic zone ?

A 10-46
Rule 10 (d) (i) and Par. 10.5, Inshore traffic zones, first paragraph.


Q 10-47
 Which vessels are allowed to use inshore traffic zones freely ?

A 10-47
Rule 10 (d) (i) and Par. 10.5, Inshore traffic zones, second paragraph.


Q 10-48
 In which particular circumstances are vessels allowed to use inshore traffic zones ?

A 10-48
Rule 10 (d) (ii) and Par. 10.5, Inshore traffic zones, third paragraph.
Click on inshore traffic zone for a summary


Q 10-49
 When are vessels normally allowed to enter a separation zone or cross a separation line ?

A 10-49
Rule 10 (e) and Par. 10.6, Separation zones or lines.
Click on enter a separation zone for a summary


Q 10-50
 Why shall vessels navigating in areas near the termination of traffic sep­aration schemes do so with particular caution ?

A 10-50
Rule 10 (f) and Par 10.7, Terminations of separation schemes.


Q 10-51
 Why must vessels not using a traffic separation scheme avoid it by as wide a margin as is practicable ?

A 10-51
Rule 10 (h) and Par. 10.9, Vessels not using a separation scheme.


Q 10-52
 Under what condition are vessels engaged in fishing allowed to fish in a traffic lane ?

A 10-52
Rule 10 (i) and Par. 10.10, Fishing vessels, first paragraph.
Click on fishing in a traffic lane for a summary


Q 10-53
 Where should fishing vessels shoot or haul their gear in a traffic sepa­ration scheme ?

A 10-53
Par. 10.10, Fishing vessels, second paragraph.
Click on fishing in a traffic lane for a summary


Q 10-54
 Where in a traffic separation scheme are vessels engaged in fishing al­lowed to steer any course ?

A 10.54
Par. 10.10, Fishing vessels, last paragraph.


Q 10-55
 Which vessels are not allowed to impede the safe passage of a power- driven vessel following a traffic lane ?

A 10-55
Rule 10 (j) and Par. 10.11, small craft and sailing vessels.
Click on impeding the safe passage in a traffic lane for a summary


Q 10-56
 Comment the derogations made to Rule 10 for vessels restricted in their ability to manoeuvre.

A 10-56
Rule 10 (k) and (l) and Par. 10.12, Vessels restricted in their ability to manoeuvre.


Q 10-57
 What can happen to vessels violating Rule 10 ?

A 10-57
Important Note (after Par. 10.12)


Q 10-58
 What are mandatory reporting systems ?

A 10-58
Marine Guidance Note, MGN 128 (M + F), Navigation in the Dover Strait.


About 1500 slides and 50 animations are available on our DVD Colregs Presentation which can be purchased online (click on books or read the books).