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Cambodia

Area code 855 Common abbreviation K Last updated 23-3-2019
Road class Syntax explanation Administrative subordination Sub classes Zones System Remarks
Asian highway A[0-9]<2> Asia See Asia
Expressway E[1-9] National Derived from national highways
National Road (NR)[0-9]<1-2>{A} National 1-d Spider-web
2-d
Provincial Road (PR)[1-3][0-9]<2-3>{[A-H]} National Determined by first digit:
1 west
2 north
3 east
Some clustering
(PR)[1-3][A-Z]<2-3>[1-8]
General description:
Expressway numbers were introduced in 2019. The only known number so far is the E4.
National roads: 1-digit numbers radiate in counterclockwise order from Phnom Penh.
2-d numbers are less important roads.
In French the roads have prefix RN.
Provincial roads: Numbers either have 3 or 4 digits, or one digit indicating the zone, a 2- or 3-letter province abbreviation and a digit.
Both systems share the same zones.
In French the roads have prefix RD.
The old system:
2-d national numbers were usually derived from 1-d RN numbers by adding a digit at the end. 3-d provincial numbers were derived from 2-d RN and RP numbers by adding a digit at the end and from 1-d RN numbers by adding a zero and a digit at the end.
The derived roads were linked to the main roads. Examples:
Main Derived Type
1 15 N>N (exception)
4 43 N>P
12 126 N>P
1 106 N>P with extra 0
58 581 P>P
Road signs: Green with white text for through traffic and blue with white text for local destinations. Road numbers in a blue chevron marker as in Hungary with white text (though sometimes also white with black text) on directional signage and black with white text on kilometer markers. Alternatively, a shield like the American US highways is also used, both for national and provinical roads.
Signs are usually in Cambodian (Khmer) and English.
History: Around 2000, a new system for provincial roads was introduced, many provincial roads became national roads and a few national roads also changed their numbers. Overview of some number changes:
Old N Old P New N New P Remarks
10 57
101 118B
102 310
106 313A
109 315
12 62 2624 / 2646 / 2647
121 2622
124 2624
126 64
127 declassified
13 7 / 76 / 74
131 76 374
132 declassified
135 377D
136 378
141 76
142 declassified
15 11
151 3KC1 / 3KD1 / 380
153 8
154 3133
16 31 / 33
161 1315
18 48
19 78
194 378 / 3785
197 3789
198 declassified
203 129
205 126
21 71
212 2712
213 2714
214 264A
24 13 3136
241 3130
242 3PV1
25 22
26 51
30 21 / 21A
31 130 / 120A
32 147
35 133A
41 53 151B
42 44
43 declassified
44 46
51 1440
56 55 155
563 55
57 157
58 1593
581 159B
61 270 / 279
62 264B
63 266A
631 2644
661 2663
662 266D / 2SR2
67 266F
68 68 unchanged
69 56
69b 2669
72 371
73 370
74 370A
75 73
76 370B
77 373A
782 3134
814 266E
815 268A
97 declassified
Sources and links: various maps and websites; Thomas Kneissl

    Official sites:
  1. Ministry of public works and transport
  2. Small scale road map
  3. Detailed road map 2006

  4. Other links:
  5. Picture of a sign with number E4
  6. ultimatejourney.com road pictures

  7. Other pages within this site:
  8. Asia
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