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by William Armstrong
Updated:
26 Nov 2011
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Map Rally Example 2 Solution

Genre: Logic / Rules Rating: 5 - Medium Source: Perplexercises Rally Ex. 2
Brain Functions: Rule following / Logic Puzzle    Hint

You turn off of CENTER and onto ADAMS. NOTE RIGHT comes into effect, but before you come to a TEE, you come to CIRCLE. Rule 3 tells you to execute each RI as soon as possible; a NOTE is done only when it applies. If you did NOTE RIGHT before you did RI 8, your answer to Q4 would be HILL. However, you should have gone left on CIRCLE earlier, and your answer to Q4 should be MAIN.

After you turn right onto HILL for RI 9, you come to a TEE where HILL ends at CLIFF. Rule 7 told you not to drive over any CLIFF. The rule is higher priority than the NOTE; so you had to make a U-turn to avoid CLIFF. People who drive over CLIFF turn onto MAIN from CENTER and say Yes to Q5. Those who make a U-turn reach MAIN on HILL and say No to Q5.

MAIN ends at PALM. The area is a TEE. NOTE RIGHT tells you to turn right. RI 11 tells you to turn left. The NOTE is higher priority. You should turn right onto PALM and continue to look for a place where you can do RI 11. Continuing in the straightest possible direction, you travel on ADAMS, GLADE, and LAKE before you come to PALM at an intersection that is not a TEE.

The correct answers are:

Q4. MAIN
Q5. No
Q6. Yes

Please notice that the incorrect course and the correct course both end in the same place. Only the questions test whether or not you caught the trap. The incorrect course is looped back together with the correct course so that people who make errors don't know they are off course until they read the answers. This false sense of security is the result of looping, bringing the off-course route back together with the on-course route. Very tricky!

Map Rally Example 2

RI 7. L onto ADAMS

NOTE RIGHT: R at TEE RI 8. L onto CIRCLE Q4. What is the name of the first RDWY you come to? RI 9. R onto HILL Q5. Do you execute NOTE RIGHT? RI 10. R onto MAIN Q6. Do you travel on ADAMS? RI 11. L onto PALM



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