42_a_driver_handbook
When the bus flashes red lights (located at the top front and back of the bus), you must stop from either direction until the children are safely across the street and the lights stop flashing.

0042_0001__When when 0042_0004__flashes flashes 0042_0001__When->0042_0004__flashes [restriction] 0042_0024__eithe either[quant] 0042_0001__When->0042_0024__eithe [scope] 0042_0002__the_0042_0003__bus the_bus 0042_0004__flashes->0042_0002__the_0042_0003__bus [arg0] 0042_0006__lights lights 0042_0004__flashes->0042_0006__lights [arg1] 0042_0025__direction direction 0042_0024__eithe->0042_0025__direction [restriction] 0042_0026__until until 0042_0024__eithe->0042_0026__until [scope] 0042_0005__red red 0042_0006__lights->0042_0005__red [attrib] 0042_0008__located_0042_0009__at located_at 0042_0006__lights->0042_0008__located_0042_0009__at [prn] 0042_0010__the_0042_0012__front_0042_0013__and_0042_0014__back the_front_and_back 0042_0008__located_0042_0009__at->0042_0010__the_0042_0012__front_0042_0013__and_0042_0014__back [arg1] z_0042_5007 _ 0042_0008__located_0042_0009__at->z_0042_5007 [arg0] 0042_0011__top top 0042_0010__the_0042_0012__front_0042_0013__and_0042_0014__back->0042_0011__top [attrib] 0042_0016__the_0042_0017__bus the_bus 0042_0010__the_0042_0012__front_0042_0013__and_0042_0014__back->0042_0016__the_0042_0017__bus of 0042_0021__must must 0042_0022__stop stop 0042_0021__must->0042_0022__stop [scope] 0042_0020__you you 0042_0022__stop->0042_0020__you [arg0] 0042_0022__stop->0042_0025__direction from[nim] 0042_0026__until->0042_0021__must [scope] 0042_0034__and and 0042_0026__until->0042_0034__and [restriction] 0042_0029__are_0042_0031__across are_across 0042_0034__and->0042_0029__are_0042_0031__across [conj1] 0042_0037__stop stop 0042_0034__and->0042_0037__stop [conj2] 0042_0027__the_0042_0028__children the_children 0042_0029__are_0042_0031__across->0042_0027__the_0042_0028__children [arg0] 0042_0030__safely safely 0042_0029__are_0042_0031__across->0042_0030__safely [nim] 0042_0032__the_0042_0033__street the_street 0042_0029__are_0042_0031__across->0042_0032__the_0042_0033__street [arg1] 0042_0037__stop->0042_0006__lights [arg0] 0042_0038__flashing flashing 0042_0037__stop->0042_0038__flashing [arg1] 0042_0038__flashing->0042_0006__lights [arg0]
arc(r_0042_0001__When,r_0042_0004__flashes,restriction).
arc(r_0042_0001__When,r_0042_0024__either__quant,scope).
arc(r_0042_0004__flashes,r_0042_0002__the_r_0042_0003__bus,arg0).
arc(r_0042_0004__flashes,r_0042_0006__lights,arg1).
arc(r_0042_0006__lights,r_0042_0005__red,attrib).
arc(r_0042_0006__lights,r_0042_0008__located_r_0042_0009__at,prn).
arc(r_0042_0008__located_r_0042_0009__at,r_0042_0010__the_r_0042_0012__front_r_0042_0013__and_r_0042_0014__back,arg1).
arc(r_0042_0008__located_r_0042_0009__at,z_0042_5007,arg0).
arc(r_0042_0010__the_r_0042_0012__front_r_0042_0013__and_r_0042_0014__back,r_0042_0011__top,attrib).
arc(r_0042_0010__the_r_0042_0012__front_r_0042_0013__and_r_0042_0014__back,r_0042_0016__the_r_0042_0017__bus,r_0042_0015__of).
arc(r_0042_0021__must,r_0042_0022__stop,scope).
arc(r_0042_0022__stop,r_0042_0020__you,arg0).
arc(r_0042_0022__stop,r_0042_0025__direction,r_0042_0023__from__nim).
arc(r_0042_0024__either__quant,r_0042_0025__direction,restriction).
arc(r_0042_0024__either__quant,r_0042_0026__until,scope).
arc(r_0042_0026__until,r_0042_0021__must,scope).
arc(r_0042_0026__until,r_0042_0034__and,restriction).
arc(r_0042_0029__are_r_0042_0031__across,r_0042_0027__the_r_0042_0028__children,arg0).
arc(r_0042_0029__are_r_0042_0031__across,r_0042_0030__safely,nim).
arc(r_0042_0029__are_r_0042_0031__across,r_0042_0032__the_r_0042_0033__street,arg1).
arc(r_0042_0034__and,r_0042_0029__are_r_0042_0031__across,conj1).
arc(r_0042_0034__and,r_0042_0037__stop,conj2).
arc(r_0042_0037__stop,r_0042_0006__lights,arg0).
arc(r_0042_0037__stop,r_0042_0038__flashing,arg1).
arc(r_0042_0038__flashing,r_0042_0006__lights,arg0).


IP-MAT PP-SCON P-CONN When IP-ADV NP-SBJ D the N bus VBP;~Tn flashes NP-OB1 ADJP ADJ red NS lights PULB -LRB- PRN IP-PPL VVN;~Ipr located PP-CLR P-ROLE at NP D the ADJP ADJ top NLYR NLYR N front CONJP CONJ and NLYR N back PP P-ROLE of NP D the N bus PURB -RRB- PUNC , NP-SBJ PRO you MD;~cat_Vi must IP-INF-CAT VB;~I stop PP-NIM P-ROLE from NP Q either N direction PP-SCON P-CONN until IP-ADV ILYR ILYR NP-SBJ D the NS children BEP;~Ipr are ADVP-NIM ADV safely PP-CLR P-ROLE across NP D the N street CONJP CONJ and ILYR NP-SBJ D the NS lights VB;~Tg stop IP-PPL-OB1 VAG;~I flashing PUNC .
( (IP-MAT (PP-SCON (P-CONN When;{when})
                   (IP-ADV (NP-SBJ;{SCHOOL_BUS} (D the;{the})
                                                (N bus;{bus}))
                           (VBP;~Tn flashes;{flash})
                           (NP-OB1;{RED_LIGHTS} (ADJP (ADJ red;{red}))
                                                (NS lights;{light})
                                                (PULB -LRB-)
                                                (PRN (IP-PPL (VVN;~Ipr located;{locate[at]})
                                                             (PP-CLR (P-ROLE at;{at})
                                                                     (NP (D the;{the})
                                                                         (ADJP (ADJ top;{top}))
                                                                         (NLYR (NLYR (N front;{front}))
                                                                               (CONJP (CONJ and;{and})
                                                                                      (NLYR (N back;{back}))))
                                                                         (PP (P-ROLE of;{of})
                                                                             (NP (D the;{the})
                                                                                 (N bus;{bus})))))))
                                                (PURB -RRB-))))
          (PUNC ,)
          (NP-SBJ (PRO you;{you}))
          (MD;~cat_Vi must;{must})
          (IP-INF-CAT (VB;~I stop;{stop})
                      (PP-NIM (P-ROLE from;{from})
                              (NP (Q either;{either})
                                  (N direction;{direction}))))
          (PP-SCON (P-CONN until;{until})
                   (IP-ADV (ILYR (ILYR (NP-SBJ (D the;{the})
                                               (NS children;{child}))
                                       (BEP;~Ipr are;{be[across]})
                                       (ADVP-NIM (ADV safely;{safely}))
                                       (PP-CLR (P-ROLE across;{across})
                                               (NP (D the;{the})
                                                   (N street;{street}))))
                                 (CONJP (CONJ and;{and})
                                        (ILYR (NP-SBJ;{RED_LIGHTS} (D the;{the})
                                                                   (NS lights;{light}))
                                              (VB;~Tg stop;{stop})
                                              (IP-PPL-OB1 (VAG;~I flashing;{flash})))))))
          (PUNC .))
  (ID 42_a_driver_handbook))