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| Date | Sunday 12 May 1991 |
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| Start time | 14:00 |
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| Event |  Monaco GP |
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| Circuit | Monte Carlo |
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| Event Format | Race of 78 laps |
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| Championship | World Championship |
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| Race number | #4 of 16 in 1991
#504 (of all time) |
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| Laps | 78 |
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| Circuit Perimeter | 3328 m |
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| Race Distance | 3328 × 78 = 259.584 km |
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| Grid Format | 2-2-2-2 (staggered) |
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| Pole Position | Right |
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| First Corner | Right |
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| Track Direction | Clockwise |
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| Weather | Cloudy, Mild, Dry |
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| Entries | 34 |
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| Qualifiers | 26 |
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| Finishers | 12 |
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| Debutants | None |
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| Records Broken |
1. Most Failures to Pre-Qualify –  Coloni (42)
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| Records Extended |
1. Most Drivers' Championship Points Scores – Ferrari (556),
2. Most Retirements –  Lotus (530),
3. Most Constructors' Championship Points Scores – Ferrari (424),
4. Most Podium Finishes – Ferrari (357),
5. Most Constructors' Championship Points Scores –  Alain Prost (111),
6. Most Retirements – Riccardo Patrese (118),
7. Most Drivers' Championship Points Scores – Alain Prost (111),
8. Most 3rd Place Finishes – Ferrari (113),
9. Most Fastest Laps – Ferrari (121),
10. Most Fastest Laps – Alain Prost (35),
11. Most Laps Led –  Ayrton Senna (2390),
12. Most Race Entries – Lotus (1212),
13. Most Race Entries – Riccardo Patrese (213),
14. Most Poles – Ayrton Senna (56),
15. Most 7th Place Qualifications – Ferrari (70),
16. Most 9th Place Qualifications – Ferrari (57)
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